New chiral N-phosphonyl imines have been synthesized in good yields under convenient reaction conditions. These chiral N-phosphonyl imines can serve as efficient electrophiles for asymmetric addition reactions with lithium ketone enolates. Good chemical yields and excellent diastereoselectivities were obtained for twelve examples. The N-1-naphthyl group of the chiral auxiliary was found to be superior
在方便的反应条件下,以良好的收率合成了新的手性 N-膦酰基
亚胺。这些手性 N-膦酰基
亚胺可作为有效的亲电子试剂与
锂酮烯醇化物进行不对称加成反应。十二个实施例获得了良好的
化学收率和优异的非对映选择性。发现手性助剂的 N-1-
萘基在控制该反应的非对映选择性方面优于其苄基对应物。通过在室温下用
甲醇中的 HBr
水溶液处理可以容易地除去手性助剂,从而以高收率得到游离的对
氨基酮。