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AZD 3264 an IKK2 Inhibitor from Astra Zeneca



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AZD 3264

MW 441.50

CAS 1609281-86-8

MF C21 H23 N5 O4 S
3-​Thiophenecarboxamide​, 2-​[(aminocarbonyl)​amino]​-​5-​[4-​(3,​5-​dimethyl-​4-​isoxazolyl)​-​2-​[(3S)​-​3-​pyrrolidinyloxy]​phenyl]​-

Inhibition of IkB-kinase IKK2 has been identified as one of the novel pathways to treat inflammatory conditions such as asthma, chronic pulmonary obstructive disorder (COPD) and rheumatoid arthritis

Astrazeneca Ab,



WO 2003010158




The synthesis began with the aromatic nucleophilic substitution reaction of 2-fluorobromobenzene (2) with (S)-N-Boc-3-pyrrolidinol 3 to give the bromo intermediate 4, which was borylated via halogen metal exchange using n-hexLi in THF followed by treatment with triisopropyl borate and acidic work-up to give the boronic acid intermediate 5. Suzuki coupling of the boronic acid 5 with bromothiophene 6(2)afforded the intermediate 7. Intermediate 7 was subjected to regioselective bromination using bromine in acetic acid. This reaction was nonregioselective and yielded 17% of the required isomer 8. The bromo compound 8 was coupled with isoxazole boronate ester 9 by another Suzuki reaction to get the title compound. The overall yield of the synthesis was <6%.





Org. Process Res. Dev., Article ASAP
DOI: 10.1021/op500105n


Abstract Image

An efficient and scalable synthesis of AZD3264 is described in which the differential reactivities of various halogen atoms have been employed. The process involves five linear chemical steps with three isolated stages starting from commercially available fragments.

AZD3264 (1)

A stirred solution of tert-butyl (3S)-3-[2-(4-carbamoyl-5-methyl-2-thienyl)-5-(3,5-dimethylisoxazol-4-yl)phenoxy]pyrrolidine-1-carboxylate (16) (2.65 kg, 4.63 mol) in tetrahydrofuran (25 L) w……………………………………………………title compound in 91% yield.

To a stirred suspension of crude AZD3264 (1) (1.75 kg, 3.98 mol) in methanol (23.75 L) and water (2.64 L) was added formic acid (0.24 kg, 5.18 mol), and the mixture was heated to 40 °C for 1.5 h, cooled to 25 °C, and basified with aqueous ammonia (12.29 M in water, 1.62 L, 19.92 mol). The product was isolated by filtration.
 1H NMR (DMSO-d6, 400 MHz): δ 1.92–2.10 (m, 2H), 2.28 (s, 3H), 2.46 (s, 3H), 2.75–2.82 (m, 1H), 3.00–3.12 (m, 3H), 5.11–5.12 (m, 1H), 6.90 (br, 2H), 7.00–7.03 (m, 2H), 7.30 (br, 1H), 7.70–7.72 (m, 2H), 7.83 (s, 1H), 10.93 (s, 1H).
 13C NMR (DMSO-d6, 100.6 MHz): δ 10.54, 11.42, 32.94, 45.51, 53.00, 79.37, 111.76, 114.17, 115.66, 120.70, 121.20, 122.77, 125.39, 126.92, 128.84, 150.12, 152.54, 154.50, 158.13, 165.14, 167.06.
DEPT NMR (DMSO-d6, 100.6 MHz): δ 10.54, 11.43, 32.94, 45.51, 53.01, 79.35, 114.17, 120.70, 121.20, 126.92.
HRMS calcd for C21H24N5O4S (M + H)+: 442.1543, found 442.1554.
[α]25D −13.80 (c 0.5, DMSO)
Journal of Medicinal Chemistry (2013), 56(18), 7232-7242 reports similar analogues


  1. […] Exploiting the Differential Reactivities of Halogen Atoms: Development of a Scalable Route to IKK2 Inhibitor AZD3264, Pharmaceutical Development, AstraZeneca India Pvt. Ltd, Hebbal, OffBellary Road, Bangalore 560024, India, Org. Process Res. Dev.2014, 18, 646−651 Détails da la publication ici: […]

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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 LIFE SCIENCES 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 PLUS year tenure till date June 2021, 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, 90 Lakh plus views on dozen plus blogs, 233 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 33 lakh plus views on New Drug Approvals Blog in 233 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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