[reaction: see text] Diastereoselective reductive coupling reactions of omega-vinyl tethered cyclic imides are achieved by a preexisting stereocenter at an allylic position. Particularly noteworthy is the effective use of a 1:2 mixture of Ti(O-i-Pr)4 and n-BuLi to afford the N-acylhemiaminal products in good yields.
[反应:见正文]ω-
乙烯基系环
酰亚胺的非对映选择性还原偶联反应是通过预先存在于烯丙基位置的立体中心实现的。特别值得注意的是有效使用Ti(Oi-Pr)4和n-BuLi的1:2混合物以良好的收率得到N-酰基血红素产物。