Diastereoselectivity in the aldol and the conjugate additions of 2â²-hydroxy-1,1â²-binaphthyl ester enolates with a variety of carbonyl electrophiles has been examined. The ester enolate generated by BuLi reacts with several aldehydes to give the threo products preferentially with high diastereoselectivity and in good yield. Satisfactory diastereoselectivity has also been observed in the minor erythro derivatives. A mechanistic interpretation of the results is made on the basis of the absolute stereochemistry of the products.
已研究了2′-羟基-1,1′-联
萘酯酮烯与多种羰基电烯的醇醛反应和结合加成反应中的二面体选择性。由BuLi生成的酯酮烯与几种醛反应,优先生成threo产物,具有高的二面体选择性和良好的收率。在少量的erythro衍
生物中也观察到了令人满意的二面体选择性。根据产物的绝对立体
化学,对结果进行了机制解释。