Chiral tertiary amines 1, 3a, 3b and 5 almost cannot catalyze the Baylis–Hillman reaction between o-nitrobenzaldehyde and methyl vinyl ketone (MVK). However, they functioned as efficient catalysts for this reaction in the presence of l-proline. The corresponding adducts were obtained in good yields with enantioselectivity of 83% ee, 81% ee, 51% ee and 66% ee, respectively.
由邻硝基
苯甲酰氯和1-脯
氨酸甲酯盐酸盐开始合成手性苯并二氮杂1衍
生物1。非对映异构体(1 R,2 R,1 'S)-(+)-2- [ N-甲基-N-(α-苯乙基)
氨基]
环己醇3a和(1 S,2 S,1 'S)-(+由(S)-α-苯基
乙胺和
环己烯氧化物经开环,非对映异构体分离和N-甲基化反应合成))- 2- [ N-甲基-N-(α-苯基乙基)
氨基]
环己醇3b。(S,由1-脯
氨酸甲酯合成S)-八氢二
吡咯并[1,2- a:1',2'- d ]
吡嗪5。手性叔胺1,图3a,图3b和5几乎不能催化之间的的Baylis-Hillman反应ö -nitrobenzaldehyde和甲基
乙烯基酮(MVK)。然而,它们在1-脯
氨酸存在下作为该反应的有效催化剂。以高收率获得相应的加合物,对映选择性分别为83%ee,81%ee,51%ee和66%ee。