Stereoselective synthesis of protected (2S,3S)-N-methyl-5-hydroxyisoleucine, a component of halipeptins
作者:Sousuke Hara、Kazuishi Makino、Yasumasa Hamada
DOI:10.1016/j.tet.2004.06.111
日期:2004.9
The stereocontrolled synthesis of the protected (2S,3S)-N-methyl-5-hydroxyisoleucine, a component of halipeptins A and B with potent anti-inflammatory activity, has been achieved. The key steps include (i) installation of a double bond to bicyclic lactam 4 using N-tert-butyl phenylsulfinimidoyl chloride, (ii) highly exo-selective Michael reaction with lithium dimethylcuprate in the presence of chlorotrimethylsilane
已经实现了立体控制合成的受保护的(2 S,3 S)-N-甲基-5-羟基异亮氨酸,这是一种具有强大抗炎活性的卤肽素A和B的成分。的关键步骤包括双键的双环内酰胺的(ⅰ)安装4使用ñ -叔丁基phenylsulfinimidoyl氯化物,(二)高度外型在甲基氯硅烷的存在下用锂dimethylcuprate体选择性迈克尔加成反应,和(iii)的Ru催化的N,O-亚苄基乙缩醛的氧化脱保护为酸酐。