作者:Jorma Hassfeld、Mathias Christmann、Markus Kalesse
DOI:10.1021/ol016677o
日期:2001.11.1
[reaction: see text]. The use of the Z-configured vinylogous silyl ketene acetals in Mukaiyama aldol reactions is described. Isopropyl alcohol as scavanger and the use of tris(pentafluorophenyl)borane as the Lewis acid are required for obtaining the gamma-alkylated syn-product selectively. In cases of alpha-chiral aldehydes, Felkin-Anh selectivity was observed.
[反应:请参见文字]。描述了Z构型的乙烯基硅烷基乙烯酮缩醛在Mukaiyama羟醛反应中的用途。为了选择性地获得γ-烷基化的合成产物,需要异丙醇作为稀溶剂,并使用三(五氟苯基)硼烷作为路易斯酸。在α-手性醛的情况下,观察到Felkin-Anh选择性。