The rearrangement of (E)-didehydroamino acid derivatives to the corresponding Z-derivatives under acid or basic catalysis as well as under the influence of radicals has been investigated. The condensation of N-benzyloxycarbonyl or N-tert-butoxycarbonyl protected alkyl 2-amino-2-(dimethoxyphosphoryl)acetates with aldehydes or ketones in dichloromethane in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene furnishes (Z)-didehydroamino acid ester derivatives diastereoselectively in excellent yields and with high purity.
研究了在酸或碱催化以及自由基影响下,(E)-二脱氢
氨基酸衍
生物重排为相应的 Z 衍
生物的过程。在 1,8- 二
氮杂双环[5.4.0]十一碳-7-烯存在下,
N-苄氧羰基或 N-叔丁氧羰基保护的 2-
氨基-2-(二甲氧基
磷酰)
乙酸烷基酯与醛或酮在
二氯甲烷中缩合,可产生非对映选择性的 (Z)-二脱氢
氨基酸酯衍
生物,收率极高,纯度也很高。