Asymmetric synthesis of the core structure of the Melodinus alkaloids
摘要:
The strategy developed for an asymmetric synthesis of (+)-meloscine (1) features an early incorporation of the aromatic ring in 1 as the 5-benzyl substituent in 2. The highly diastereoselective Birch reduction-alkylation 2 --> 3, the unraveling of 3 to the butyrolactone carboxylic acid 7, and the Mannich cyclization 9c --> 10c are the key steps in the synthesis of the core tricyclic unit in 1. (C) 1999 Elsevier Science Ltd. All rights reserved.
Asymmetric synthesis of the core structure of the Melodinus alkaloids
摘要:
The strategy developed for an asymmetric synthesis of (+)-meloscine (1) features an early incorporation of the aromatic ring in 1 as the 5-benzyl substituent in 2. The highly diastereoselective Birch reduction-alkylation 2 --> 3, the unraveling of 3 to the butyrolactone carboxylic acid 7, and the Mannich cyclization 9c --> 10c are the key steps in the synthesis of the core tricyclic unit in 1. (C) 1999 Elsevier Science Ltd. All rights reserved.