Asymmetric C–C bond forming reactions with chiral crown catalysts derived from d-glucose and d-galactose
作者:Péter Bakó、Erzsébet Czinege、Tibor Bakó、Mátyás Czugler、László Tőke
DOI:10.1016/s0957-4166(99)00485-1
日期:1999.12
induction as phase transfer catalysts in the Michael addition of 2-nitropropane to chalcone (87% ee), in the Darzens condensation of phenacyl chloride with benzaldehyde (71% ee) and in the self-condensation of phenacyl chloride (64% ee) to give 14. The absolute configurations of (−)-(2R,3S)-epoxy-3-(4-chlorophenyl)-1-phenyl-1-propanone 12 and (−)-4-chloro-(2R,3S)-epoxy-1,3-diphenyl-1-butanone 14 have
新的手性monoaza-15-crown-5衍生物与甲基-4,6- O-亚苄基-α-d-吡喃葡萄糖苷2a,2e,2g – i和甲基-4,6- O-亚苄基-α-d-已合成了吡喃半乳糖苷3a,3e,3i。这些冠醚在2-硝基丙烷的迈克尔加成至查尔酮(87%ee),苯甲酰氯与苯甲醛的Darzens缩合(71%ee)和苯甲酰氯的自缩合中作为相转移催化剂表现出显着的不对称诱导作用(64%ee)给予14。(-)-(2 R, 3 S的绝对构型)-环氧-3-(4-氯苯基)-1-苯基-1-丙酮12和(-)-4-氯-(2 R,3 S)-环氧-1,3-二苯基-1-丁酮14具有也由X射线衍射确定。