A multigram chemical synthesis of the γ-secretase inhibitor LY411575 and its diastereoisomers
作者:Abdul H. Fauq、Katherine Simpson、Ghulam M. Maharvi、Todd Golde、Pritam Das
DOI:10.1016/j.bmcl.2007.07.062
日期:2007.11
An improved chemical synthesis of N-2((2S)-2-(3,5-difluorophenyl)-2-hydroxyethanoyl)-N1-((7S)-5-methyl-6-oxo-6,7-di hydro-5H-dibenzo[b,d]azepin-7-yl)-l-alaninamide (LY411,575, 9a), a known gamma-secretase inhibitor, is described. The key synthetic steps, which used no chiral chromatography in the entire sequence, involved (1) improved microwave-assisted synthesis of a seven-membered lactam (+/-)-(5
N-2((2S)-2-(3,5-二氟苯基)-2-羟基乙酰基)-N1-((7S)-5-甲基-6-氧代-6,7-二氢-描述了一种已知的γ-分泌酶抑制剂5H-二苯并[b,d] a庚啉-7-基)-1-丙氨酰胺(LY411,575,9a)。在整个序列中不使用手性色谱的关键合成步骤涉及(1)改进微波辅助合成的七元内酰胺(+/-)-(5,7-dihydro-6H-dibenz- [b, d)azepin-6-1 2和(2)通过简单的快速硅胶色谱法从四种非对映异构体的混合物中方便地分离出纯LY411575,从拆分的氨基内酰胺5a和5b开始,所有四种非对映异构体均以对映体纯的形式产生。