Enantioselective synthesis of crotyl geminal bis(silane) and its usage for asymmetric Sakurai allylation of acetals
作者:Yang Chu、Qiang Pu、Zhixing Tang、Lu Gao、Zhenlei Song
DOI:10.1016/j.tet.2017.05.011
日期:2017.6
Enantioselective synthesis of crotyl geminal bis(silane) 4 has been developed by an asymmetric [1, 5]-hydride shift of allylic hydrazine. SnCl4-promoted Sakurai allylation of (R)-4 with acetals leads to chemoselective desilylation of SiMe3, generating E-syn-(S, R)-5 in good yields with high E/Z-, diastereo- and enantioselectivity.
通过烯丙基肼的不对称[1,5]-氢化物转移,发展了巴豆基双(硅烷)4的对映选择性合成。的SnCl 4促进的的(樱井烯丙基- [R )- 4与缩醛导致森达的化学选择性脱甲硅基3,生成ë -顺式- (小号,- [R - )5以良好的收率与高E / Z - ,diastereo-和对映选择性。