Dramatic change of regioselectivity in the addition of silylated organolithium reagents with oxazolidines induced by the presence of a titanium salt
作者:Claude Agami、Sébastien Comesse、Catherine Kadouri-Puchot
DOI:10.1016/s0040-4039(00)00947-3
日期:2000.8
Diastereoselective reactions between oxazolidines and organolithium reagents afford β-amino alcohols having chiral vinyl and alkynylsilane moieties. A meaningful change of regioselectivity, from the α- to the γ-position, occurred when these reactions were performed in the presence of titanium isopropoxide, since allyl and allenylsilane derivatives were thus produced.
恶唑烷与有机锂试剂之间的非对映选择性反应得到具有手性乙烯基和炔基硅烷部分的β-氨基醇。当在异丙醇钛存在下进行这些反应时,从α-位置到γ-位置的区域选择性发生了有意义的变化,因为由此产生了烯丙基和烯丙基硅烷衍生物。