SmI<sub>2</sub>-Mediated Intermolecular Coupling of γ-Lactam <i>N</i>-α-Radicals with Activated Alkenes: Asymmetric Synthesis of 11-Hydroxylated Analogues of the Lead Compounds CP-734432 and PF-04475270
作者:Kong-Zhen Hu、Jie Ma、Shi Qiu、Xiao Zheng、Pei-Qiang Huang
DOI:10.1021/jo301277n
日期:2013.3.1
represents the first intermolecular coupling reaction of the γ-lactam N-α-alkyl radicals of types B, B1, and B2 with activated alkenes. Two radical-based mechanisms were suggested. The asymmetric synthesis of the 11-hydroxylated analogue of the highly selective EP4 receptor agonist PF-04475270 (30), the 11-hydroxylated analogue of ocular hypotensive CP-734432 (31), compounds 35 and 36 have been achieved on
我们首次报告了PGE 2的8-氮杂类似物的合成。首次开发了由SmI 2介导的γ-内酰胺-半缩醛9,内酰胺2-吡啶硫醚17和内酰胺2-吡啶砜18与活化烯烃/炔烃的交叉偶联反应,相应的γ-内酰胺含量为49-78% ,分别为45–75%和75–90%。内酰胺2-吡啶基硫醚和2-吡啶基砜的反应以≥12:1的反式-非对映选择性进行。这代表了B,B1和B2型的γ-内酰胺N -α-烷基的首次分子间偶联反应与活化的烯烃。建议了两种基于自由基的机制。高选择性EP 4受体激动剂PF-04475270(30)的11-羟基化类似物,眼压低的CP-734432(31),化合物35和36的11-羟基化类似物的不对称合成是在以下基础上实现的:这种方法。