yields. Z stereoselectivity of the created alkenyl group is obtained with N2CHSiMe3, whereas N2CHCO2Et favours selectively the E configuration for the same double bond. The diastereoselectivity exo/endo depends on the size of the created ring. The X‐ray structures of two products have been determined, showing the stereochemistry of the compounds. The reaction can be understood by initial [2+2] addition
在[RuCl(cod)(Cp *)]存在下,含N(
PG)C(CF 3)(CO 2 R)部分的
氟化1,6-烯和1,7-烯炔与重氮化合物的反应(cod = cycloocta-1,5-diene,Cp * = C 5 Me 5,
PG =保护基)作为催化剂前体会导致
氟化
3-氮杂双环[3.1.0]己烷-2-羧酸盐和4-氮杂
双环[4.1.0]庚烷-3-
羧酸盐。该催化转化被应用于各种保护基团,并已被证明是一种选择性和通用的合成工具,可以以高收率形成受约束的脯
氨酸或高脯
氨酸衍
生物。使用N 2 CHSiMe 3获得生成的烯基的Z立体选择性,而N 2CHCO 2 Et对于相同的双键有选择地偏向E构型。非对映选择性exo / endo取决于所生成环的大小。确定了两种产品的X射线结构,显示了化合物的立体
化学。可以通过初始[2 + 2]加重由重氮烷生成的RuCHY键和烯炔的CCH键来理解该反应,从而生成关键的