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CAS : 262352-17-0
(2R,4S)-4-[[[3,5-Bis(trifluoromethyl)phenyl]methyl](methoxycarbonyl)amino]-2-ethyl-3,4-dihydro-6-(trifluoromethyl)-1(2H)-quinolinecarboxylic acid ethyl ester
(2R,4S)-4-[(3,5-bis-trifluoromethylbenzyl)methoxycarbonylamino]-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester
Manufacturers’ Codes: CP-529414
Molecular Formula: C26H25F9N2O4
Molecular Weight: 600.47
Percent Composition: C 52.01%, H 4.20%, F 28.48%, N 4.67%, O 10.66%
Properties: Anhydrous, non-hygroscopic crystals, mp 89-90°. d 1.406.
Melting point: mp 89-90°
Density: d 1.406
Derivative Type: Ethanolate
CAS Registry Number: 343798-00-5
Molecular Formula: C26H25F9N2O4.C2H6O
Molecular Weight: 646.54
Percent Composition: C 52.02%, H 4.83%, F 26.45%, N 4.33%, O 12.37%
Properties: White crystalline powder, mp 54-58°. [a]D -93.3° (c = 1.08 in methanol). d 1.402. Non-hygroscopic. Higher aqueous soly than anhydrous form.
Melting point: mp 54-58°
Optical Rotation: [a]D -93.3° (c = 1.08 in methanol)
Density: d 1.402
Therap-Cat: Antilipemic; antiatherosclerotic.

Torcetrapib (CP-529,414, Pfizer) was a drug being developed to treat hypercholesterolemia (elevated cholesterol levels) and prevent cardiovascular disease. Its development was halted in 2006 when phase III studies showed excessive all-cause mortality in the treatment group receiving a combination of atorvastatin (Lipitor) and torcetrapib.


Medical uses

Torcetrapib has not been found to affect either cardiovascular disease or risk of death in those already taking a statin.[1]


Torcetrapib acts (as a CETP inhibitor) by inhibiting cholesterylester transfer protein (CETP), which normally transfers cholesterol from HDL cholesterol to very low density or low density lipoproteins (VLDL or LDL). Inhibition of this process results in higher HDL levels (the “good” cholesterol-containing particle) and reduces LDL levels (the “bad” cholesterol).[vague][citation needed]


The first step in the synthesis was a recently created reaction of amination to p-chlorotrifluoryltoluene, a reaction that was created by Dr. Stephen Buchwald at MIT.[2]

Development of the drug began around 1990; it was first administered in humans in 1999, and manufacturing at production scale began in Ireland in 2005.[3]

Pfizer had previously announced that torcetrapib would be sold in combination with Pfizer’s statin, atorvastatin (Lipitor); however, following media and physician criticism, Pfizer had subsequently planned for torcetrapib to be sold independently of Lipitor.[4]

Clinical trials

A 2004 trial (19 subjects, non-randomised) showed that torcetrapib could increase HDL and lower LDL with and without an added statin.[5]

Nine phase III studies were completed.[6][7][8][9][10][11][12][13][14][15]

Early termination of study

On December 2, 2006 Pfizer cut off torcetrapib’s phase III trial because of “an imbalance of mortality and cardiovascular events” associated with its use.[16] This was a sudden and unexpected event and as late as November 30, 2006 Jeff Kindler, Pfizer’s chief executive, was quoted, “This will be one of the most important compounds of our generation.”[16] In the terminated trial, a 60% increase in deaths was observed among patients taking torcetrapib and atorvastatin versus taking atorvastatin alone.[17] Pfizer recommended that all patients stop taking the drug immediately.[18]

Six studies were terminated early.[6] One of the completed studies found it raised systolic blood pressure and concluded “Torcetrapib showed no clinical benefit in this or other studies, and will not be developed further.”[19]

The drug cost $800m+ to bring into Phase III development.[20]

 Dec. 2, 2006, was a day drugmakers won’t soon forget. On that day, Pfizer, the world’s biggest drug company, faced devastating news: Its highest profile drug candidate, the cholesterol-targeted molecule torcetrapib, had increased the risk of death in a 15,000-patient clinical trial. In light of the data, Pfizer promptly pulled the plug on the cholesteryl ester transfer protein (CETP) inhibitor that already had cost more than $800 million to develop. The torcetrapib news rocked the cardiovascular research field and left Pfizer without a potential new medication to supplement the blockbuster cholesterol drug Lipitor (atorvastatin), which was careening toward the patent cliff.
A Concise Asymmetric Synthesis of Torcetrapib�, M. Guino, P. H. Phua, J-C. Caille and K. K. Hii, J. Org. Chem., 2007, 72, 6290-6293.doi:10.1021/jo071031gAbstract: Optically active torcetrapib was synthesized in seven steps from achiral precursors without the need for protecting groups, utilizing an enantioselective aza-Michael reaction to achieve asymmetry.


Example 9 Anhydrous, (-)-(2R,4S)-4-[(3,5-Bιs-trιfluoromethyl-benzyl)-methoxycarbonyl-amιnol-2- ethyl-6-trιfluoromethyl-3,4-dιhydro-2H-quιnolιne-1 -carboxylic acid ethyl ester.

A 2.6g portion of 4(S)-[(3,5-bιs-tπfluoromethyl-benzyl)-methoxycarbonyl-amιno]-2(R)- ethyl-6-tπfluoromethyl-3,4-dιhydro-2H-quιnolιne-1 -carboxylic acid ethyl ester (a mixture of predominantly amorphous material with traces of ethanolate crystalline form; the title compound was also prepared in an analogous manner starting from pure amorphous or pure ethanolate material) was charged to 13 milliliters of hexanes and heated to effect a solution at about 60°C The heat was removed and the reaction was allowed to cool to ambient over a one hour period The reaction was seeded with anhydrous (-)-(2R,4S)-4-[(3,5-bιs-tπfluoromethyl-benzyl)- methoxycarbonyl-amιno]-2-ethyl-6-trιfluoromethyl-3,4-dιhydro-2H-quιnolιne-1 – carboxylic acid ethyl ester and granulated for eighteen hours under ambient conditions. Alternately, the anhydrous crystals may be prepared from hexanes without seeding. The product was collected by filtration and air dried. The isolated product X-ray pattern matched the calculated powder pattern. Density: 1.406 Crystal System: Trigonal

Microscopy: Well formed rods and equant (fractured rods) crystals demonstrating high birefringence when viewed across the C axis. Being in the Trigonal crystal system the crystals do not demonstrate birefringence when viewed down the C axis. The crystals demonstrate a cleavage plane perpendicular to the C axis Fusion Microsocopy In Type A oil dissolution at 50°C.

Dry — clear melt at 86°C.

NMR: No trace of ethanolate

Degree of crystallmity: Highly crystalline Hygroscopicity. Non-hygroscopic at 100% relative humidity over 48 hours.

Appearance: Free flowing white powder

Lit References:
Cholesteryl ester transfer protein (CETP) inhibitor. Prepn: M. P. DeNinno et al., WO 0017164; eidem, US6197786 (2000, 2001 both to Pfizer); of crystalline forms: D. J. M. Allen et al., WO 0140190 (2001 to Pfizer).
Mechanism of action study: R. W. Clark et al., J. Lipid Res. 47, 537 (2006).
Clinical evaluation of effects on HDL cholesterol levels: R. W. Clark et al.,Arterioscler. Thromb. Vasc. Biol. 24, 490 (2004); M. E. Brousseau et al., N. Engl. J. Med. 350, 1505 (2004).
Review of clinical development in combination with atorvastatin: J. R. Burnett, Curr. Opin. Invest. Drugs 6, 944-950 (2005).



  1.  Keene, D; Price, C; Shun-Shin, MJ; Francis, DP (Jul 18, 2014). “Effect on cardiovascular risk of high density lipoprotein targeted drug treatments niacin, fibrates, and CETP inhibitors: meta-analysis of randomised controlled trials including 117,411 patients.”. BMJ (Clinical research ed.) 349: g4379. PMID 25038074.
  2.  Buchwald, Stephen (July 23, 2004). “Research Projects”. Retrieved 2007-10-04.
  3. “Pfizer Begins Production at Torcetrapib/Atorvastatin Manufacturing Facility” (Press release). Pfizer. June 22, 2005. Retrieved 2006-12-03.
  4.  Berenson, Alex (July 26, 2006). “Heart Pill to Be Sold by Itself”. Business (The New York Times). Retrieved 2006-12-03.
  5. Brousseau, ME; Schaefer EJ; Wolfe ML; Bloedon LT; Digenio AG; Clark RW; Mancuso JP; Rader DJ (April 8, 2004). “Effects of an inhibitor of cholesteryl ester transfer protein on HDL cholesterol” (abstract). New England Journal of Medicine 350 (15): 1505–1515. doi:10.1056/NEJMoa031766. PMID 15071125. Retrieved 2006-12-03.
  7. Phase III Assess HDL-C Increase And Non-HDL Lowering Effect Of Torcetrapib/Atorvastatin Vs. Fenofibrate
  8. Phase III Study To Evaluate The Effect Of Torcetrapib/Atorvastatin In Patients With Genetic High Cholesterol Disorder
  9. Phase III Study To Evaluate The Safety And Efficacy Of Torcetrapib/Atorvastatin In Subjects With Familial Hypercholerolemia
  10. Phase III Study Comparing The Efficacy & Safety Of Torcetrapib/Atorvastatin And Atorvastatin In Subjects With High Triglycerides
  11. Phase III Clinical Trial Comparing Torcetrapib/Atorvastatin To Simvastatin In Subjects With High Cholesterol
  12. Phase III Study of Torcetrapib/Atorvastatin vs Atorvastatin Alone or Placebo in Patients With High Cholesterol
  13. Phase III Coronary IVUS Study to Compare Torcetrapib/Atorvastatin to Atorvastatin Alone in Subjects With Coronary Heart Disease (ILLUSTRATE)
  14. Phase III Lipitor Trial To Study The Effect Of Torcetrpib/Atorvastatin To Atorvastatin Alone.
  15. Phase III Carotid B-Mode Ultrasound Study to Compare Anti-Atherosclerotic Effect of Torcetrpib/Atorvastatin to Atorvastatin Alone. (RADIANCE 1)
  16.  Berenson, Alex (December 3, 2006). “Pfizer Ends Studies on Drug for Heart Disease”. The New York Times. Retrieved 2006-12-03. (registration required)
  17.  Theresa Agovino (Associated Press) (December 3, 2006). “Pfizer ends cholesterol drug development”. Yahoo! News. Retrieved 2006-12-03.[dead link] Each study arm (torcetrapib + atorvastatin vs. atorvastatin alone) had 7500 patients enrolled; 51 deaths were observed in the atorvastatin alone arm, while 82 deaths occurred in the torcetrapib + atorvastatin arm. (Link dead as of 15 January 2007)
  18. Associated Press (December 2, 2006). “Pfizer cuts off cholesterol drug trials”. Yahoo! News ( Retrieved 2006-12-03.[dead link] (Link dead as of 15 January 2007)
  19.  Bots et al.; Visseren, Frank L; Evans, Gregory W; Riley, Ward A; Revkin, James H; Tegeler, Charles H; Shear, Charles L; Duggan, William T et al. (July 2007). “Torcetrapib and carotid intima-media thickness in mixed dyslipidaemia (RADIANCE 2 study): a randomised, double-blind trial”. The Lancet 370 (9582): 153–160. doi:10.1016/S0140-6736(07)61088-5.
  20. Cutler, D. M. (2007-03-29). “The Demise of the Blockbuster?”. The New England Journal of Medicine (Massachusetts Medical Society) 356 (13): 1292–1293. doi:10.1056/NEJMp078020.ISSN 1533-4406. PMID 17392299. Retrieved 2007-04-23.

External links

Keywords: Antilipemic; CETP Inhibitor; Antiatherosclerotic.

1 Comment

  1. Sairam Ram says:

    Hai , Greetings of the day , I have some busy , Please don’t send messages

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DR ANTHONY MELVIN CRASTO, Born in Mumbai in 1964 and graduated from Mumbai University, Completed his Ph.D from ICT, 1991,Matunga, Mumbai, India, in Organic Chemistry, The thesis topic was Synthesis of Novel Pyrethroid Analogues, Currently he is working with GLENMARK PHARMACEUTICALS LTD, Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 30 plus yrs, Prior to joining Glenmark, he has worked with major multinationals like Hoechst Marion Roussel, now Sanofi, Searle India Ltd, now RPG lifesciences, etc. He has worked with notable scientists like Dr K Nagarajan, Dr Ralph Stapel, Prof S Seshadri, Dr T.V. Radhakrishnan and Dr B. K. Kulkarni, etc, He did custom synthesis for major multinationals in his career like BASF, Novartis, Sanofi, etc., He has worked in Discovery, Natural products, Bulk drugs, Generics, Intermediates, Fine chemicals, Neutraceuticals, GMP, Scaleups, etc, he is now helping millions, has 9 million plus hits on Google on all Organic chemistry websites. His friends call him Open superstar worlddrugtracker. His New Drug Approvals, Green Chemistry International, All about drugs, Eurekamoments, Organic spectroscopy international, etc in organic chemistry are some most read blogs He has hands on experience in initiation and developing novel routes for drug molecules and implementation them on commercial scale over a 30 year tenure till date Dec 2017, Around 35 plus products in his career. He has good knowledge of IPM, GMP, Regulatory aspects, he has several International patents published worldwide . He has good proficiency in Technology transfer, Spectroscopy, Stereochemistry, Synthesis, Polymorphism etc., He suffered a paralytic stroke/ Acute Transverse mylitis in Dec 2007 and is 90 %Paralysed, He is bound to a wheelchair, this seems to have injected feul in him to help chemists all around the world, he is more active than before and is pushing boundaries, He has 9 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 50 Lakh plus views on dozen plus blogs, He makes himself available to all, contact him on +91 9323115463, email, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 19 lakh plus views on New Drug Approvals Blog in 216 countries...... , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc

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