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NNC 45-0781



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NNC 45-0781

Molecular Formula C27H29NO3
Molecular Weight 415.5241

CAS 207277-66-5

  • 2H-1-Benzopyran-7-ol, 3,4-dihydro-3-phenyl-4-[4-[2-(1-pyrrolidinyl)ethoxy]phenyl]-, cis-(-)-
  • (3S,4R)-3,4-Dihydro-3-phenyl-4-[4-[2-(1-pyrrolidinyl)ethoxy]phenyl]-2H-1-benzopyran-7-ol

2H-1-Benzopyran-7-ol, 3,4-dihydro-3-phenyl-4-(4-(2-(1-pyrrolidinyl)ethoxy)phenyl)-, (3S,4R)-

  • OriginatorNovo Nordisk
  • ClassOsteoporosis therapies; Pyrrolidines; Small molecules
  • Mechanism of ActionSelective estrogen receptor modulators


WO 9818776

WO 9818771

WO 2003063859

A quantitative structure activity relationship study on cis-3,4-diaryl hydroxy chromones as high affinity partial agonists for the estrogen receptor
Chemistry: An Indian Journal (2003), 1, (3), 207-214


EP 0937057; WO 9818771, EP 0937060; WO 9818776

Coumarin (III) was prepared by condensation of benzophenone (I) with phenylacetic acid (II) in the presence of Ac2O and Et3N. Reduction of the lactone function of (III) with LiAlH4, followed by acidic treatment furnished diaryl chromene (IV). Subsequent hydrogenation of (IV) over Pd/C gave rise to the racemic cis chromane (V), which was O-alkylated with 1-(2-chloroethyl) pyrrolidine (VI) producing the corresponding (pyrrolidinyl)ethoxy derivative. Resolution by means of active ditoluoyl tartaric acid yielded the desired (-)-enantiomer (VII). Finally, cleavage of the methoxy group using pyridine hydrochloride at 150 C provided the title compound.


Bioorg Med Chem 2002,10(1),125


The syntheses and in vitro pharmacological evaluation of a number of cis-3,4-diaryl-hydroxy-chromanes are reported, along with the results of a thorough in vivo profiling of the tissue-selective estrogen partial-agonist NNC 45-0781 [3, (−)-(3S,4R)-7-hydroxy-3-phenyl-4-(4-(2-pyrrolidinoethoxy)phenyl)chromane]. These studies showed that NNC 45-0781 is a very promising candidate for the prevention of post-menopausal osteoporosis, and the treatment of other health issues related to the loss of endogenous estrogen production.

The synthesis and pharmacological evaluation of a series of new tissue-selective estrogens, the cis-3,4-diaryl-hydroxy-chromanes, is described.

Unlabelled figure



(-)-(3S,4R)-7-Hydroxy-3-phenyl-4-(4-(2-pyrrolidinoethoxy)phenyl)chromane (3,=9a).

colorless powder 3, which contained 0.25 mol equiv of ethanol of crystallization; 0.90 g (27% yield),

mp 221–223 C.

1 H NMR (DMSOd6, 400 MHz) d: 1.60–1.73 (m, 4H), 2.40–2.50 (m, 4H), 2.69 (t, 2H), 3.47–3.57 (m, 1H), 3.92 (t, 2H), 4.14–4.25 (m, 2H), 4.32 (dd, 1H), 6.27 (dd, 1H), 6.30 (d, 1H), 6.44 (d, 2H), 6.60 (d, 2H), 6.65 (d, 1H), 6.70–6.80 (m, 2H), 7.09–7.20 (m, 3H), 9.25 (s, 1H).

MS (EI): 415 (M+), 84. HR-MS; calcd for C27H30NO3 (M+H+) 416.2225, found 416.2198. HR-MS; calcd for C28H32NO3 (M+H+) 430.2382, found 430.2376.

Chiral HPLC: Chiradex A, 5m, 2504 mm (Merck) column; eluent, 6:4 methanol/0.2% aqueous triethylammonium acetate buffer, pH=5.2; flow, 0.5 mL/min; UV 220 nm; Rt=19.2 min, >98%ee. Elemental analysis; calcd for C27H29NO3 0.25C2H5OH; C, 77.35; H, 7.20; N, 3.28%; found C, 77.39; H, 7.29; N, 3.12%. [a] 20 D=283 (c=1.004% in ethanol/3M HCl, 80:20). P.



Abstract Image

A highly enantioselective method for quick access to dihydrocoumarins is reported. The reaction involves a cooperative catalytic process with carbene and in situ generated Brønsted acid as the catalysts. α-Chloro aldehyde and readily available and stable o-hydroxybenzhydryl amine substrates were used to generate reactive azolium ester enolate and ortho-quinone methide (o-QM) intermediates, respectively, to form dihydrocoumarins with exceptionally high diastereo- and enantioselectivities. The catalytic reaction products can be easily transformed to valuable pharmaceuticals and bioactive molecules.

Carbene and Acid Cooperative Catalytic Reactions of Aldehydes and o-Hydroxybenzhydryl Amines for Highly Enantioselective Access to Dihydrocoumarins

 Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
 Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, People’s Republic of China
Org. Lett., Article ASAP
DOI: 10.1021/acs.orglett.7b02883
Publication Date (Web): October 25, 2017
Copyright © 2017 American Chemical Society

/////////////NNC 45-0781


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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 AFRICURE PHARMA, ROW2TECH, NIPER-G, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Govt. of India as ADVISOR, earlier assignment was with GLENMARK LIFE SCIENCES LTD, as CONSUlTANT, Retired from GLENMARK in Jan2022 Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 32 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, 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 32 PLUS year tenure till date Feb 2023, 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 100 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 100 Lakh plus views on dozen plus blogs, 227 countries, 7 continents, 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 38 lakh plus views on New Drug Approvals Blog in 227 countries...... , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc He has total of 32 International and Indian awards

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