The catalytic activity of (5R)-5-(4-imidazolylmethyl)-2,4-imidazolidinedione (3) was examined in the asymmetric hydrocyanation of 3-phenoxybenzaldehyde (1a) to (S)-2-hydroxy-2-(3-phenoxyphenyl)acetonitrile ((S)-2a), an important alcohol moiety of optically active pyrethroid insecticides. Among the catalysts, 3-benzyl derivative (3d) exhibited moderate enantioselectivities for 1a and other benzaldehydes.
测定了(5R)-5-(4-
咪唑基亚甲基)-2,4-
咪唑啉二酮(3)在3-苯氧
苯甲醛(1a)不对称
氰醇化反应中的催化活性,生成手性拟
除虫菊酯类杀虫剂的重要醇部分——(S)-2-羟基-2-(3-苯氧苯基)
乙腈((S)-2a)。在各种催化剂中,3-苄基衍
生物(3d)对1a及其他
苯甲醛表现出中等程度的立体选择性。