Optically active helical poly[(S)-3-(9-alkylfluoren-9-yl)propylene oxide]s (poly-(S)-AFPOs) without additional stereogenic units were used to induce the enantioselective addition of ethylmagnesium bromide to aldehydes, giving up to 53% ee of the products. It is the helically chiral environment rather than the point chirality that governs the enantioselective inducement of the addition reaction. Poly-(S)-AFPOs could be recovered simply, post-treated conveniently and used repeatedly.
光学活性的螺旋聚[(S)-3-(9-烷基
芴-9-基)
丙烯氧化物](聚-(S)-AFPOs)在没有额外立体中心的情况下用于诱导
乙基溴化镁对醛的选择性加成,产物的对映体过量可达53%。在该加成反应的选择性诱导中,主导因素是螺旋手性环境而非点手性。聚-(S)-AFPOs可以简单回收,方便后处理并可重复使用。