Catalytic, Asymmetric Synthesis of the Carbacephem Framework
摘要:
A catalytic, asymmetric synthesis of the carbacephem beta-lactam framework is reported. The initial asymmetric center was established by catalytic hydrogenation of beta-keto ester 12 with (S)-Ru-BINAP. The beta-lactam ring was prepared using the hydroxamate approach (14 --> 15). The nitrogen substituent at C7 was introduced by the nucleophile transfer reaction (15 --> 17), and the six-membered ring of the carbacephem was prepared by a directed Dieckmann condensation (24 --> 25).
Catalytic, Asymmetric Synthesis of the Carbacephem Framework
摘要:
A catalytic, asymmetric synthesis of the carbacephem beta-lactam framework is reported. The initial asymmetric center was established by catalytic hydrogenation of beta-keto ester 12 with (S)-Ru-BINAP. The beta-lactam ring was prepared using the hydroxamate approach (14 --> 15). The nitrogen substituent at C7 was introduced by the nucleophile transfer reaction (15 --> 17), and the six-membered ring of the carbacephem was prepared by a directed Dieckmann condensation (24 --> 25).
Catalytic, Asymmetric Synthesis of the Carbacephem Framework
作者:Peter R. Guzzo、Marvin J. Miller
DOI:10.1021/jo00096a031
日期:1994.8
A catalytic, asymmetric synthesis of the carbacephem beta-lactam framework is reported. The initial asymmetric center was established by catalytic hydrogenation of beta-keto ester 12 with (S)-Ru-BINAP. The beta-lactam ring was prepared using the hydroxamate approach (14 --> 15). The nitrogen substituent at C7 was introduced by the nucleophile transfer reaction (15 --> 17), and the six-membered ring of the carbacephem was prepared by a directed Dieckmann condensation (24 --> 25).