Development of Scalable Manufacturing Routes to AZD1981. Application of the Semmler–Wolff Aromatisation for Synthesis of the Indole-4-amide Core
作者:Manjunatha Sulur、Parhalad Sharma、Ravi Ramakrishnan、Ravi Naidu、Eric Merifield、Duncan M. Gill、Adrian M. Clarke、Colin Thomson、Michael Butters、Sreekanth Bachu、Colin H. Benison、Nagaraju Dokka、Emily R. Fong、David R. J. Hose、Gareth P. Howell、Siobhan E. Mobberley、Simon C. Morton、Alexander K. Mullen、Jayan Rapai、Bharathi Tejas
DOI:10.1021/op300173z
日期:2012.11.16
in which the indole 4-amide core is formed by a Semmler–Wolff aromatisation of a cyclohexenone oxime fused to a pyrrole ring. The substrate was obtained via Paal–Knorr pyrrole synthesis, followed by incorporation of the key 3-arylthio substituent by reaction with 4-chlorophenylsulfenyl chloride. In this manner, the 1,2,3,4-substitution pattern of the AZD1981 core was regiospecifically established in
描述了一种安全有效的AZD1981合成方法,其中吲哚4-酰胺核心是通过Semmler-Wolff芳环化己烯酮肟与吡咯环的芳构化而形成的。底物是通过Paal-Knorr吡咯合成获得的,然后通过与4-氯苯基亚磺酰氯反应而结合关键的3-芳硫基取代基。以这种方式,以简洁有效的望远镜序列在区域上特异性地建立了AZD1981核心的1,2,3,4-取代模式。因此,在六个化学步骤中,使用两种分离的结晶中间体,以40%的总收率获得了AZD1981。