Synthesis of an Advanced Intermediate toward the hNK-1 Antagonist with the Cyclopentane Core
作者:Yuichi Kobayashi、Kenya Nakata、Yohei Kiyotsuka、Tomoya Kitazume
DOI:10.1055/s-0031-1289863
日期:2011.12
Allylic substitution of monomethoxyacetate of 4-cyclopentene-1,3-diol (91% ee) with 4-FC6H4ZnBr (4 equiv) and CuCl (30 mol%) gave anti-SN2′ product, which upon epoxidation with MCPBA afforded α-epoxide stereoselectively. The epoxide was reduced with LiEt3BH, and the resulting alcohol was converted into the targeted amine by using Mitsunobu reactions twice with 3,5-(O2N)2C6H3CO2H and then with phthalimide.
用 4-FC6H4ZnBr (4 equiv) 和 CuCl (30 mol%)烯丙基取代 4-环戊烯-1,3-二醇的单甲氧基乙酸酯 (91% ee),得到反 SN2′产物,用 MCPBA 进行环氧化反应,可立体选择性地得到δ-环氧化物。环氧化物用 LiEt3BH 还原,得到的醇通过与 3,5-(O2N)2C6H3CO2H 和邻苯二甲酰亚胺的两次三忍反应转化为目标胺。