Efficient Method for Synthesis of Angucyclinone Antibiotics via Gold-Catalyzed Intramolecular [4 + 2] Benzannulation: Enantioselective Total Synthesis of (+)-Ochromycinone and (+)-Rubiginone B2
摘要:
An efficient synthetic approach to angucyclinone antibiotics, (+)-ochromycinone and (+)-rubiginone B-2, is reported. The key step involves the facile formation of 2,3-dihydrophenantren-4(1H)-one skeleton, an important framework of angucyclinone natural products, by using gold-catalyzed intramolecular [4 + 2] benzannulation reaction.
Efficient Method for Synthesis of Angucyclinone Antibiotics via Gold-Catalyzed Intramolecular [4 + 2] Benzannulation: Enantioselective Total Synthesis of (+)-Ochromycinone and (+)-Rubiginone B2
摘要:
An efficient synthetic approach to angucyclinone antibiotics, (+)-ochromycinone and (+)-rubiginone B-2, is reported. The key step involves the facile formation of 2,3-dihydrophenantren-4(1H)-one skeleton, an important framework of angucyclinone natural products, by using gold-catalyzed intramolecular [4 + 2] benzannulation reaction.
Diastereoselection in the conjugate additions of organocopper reagents to N-enoyloxazolidinones
作者:David R Williams、William S Kissel、Jie Jack Li
DOI:10.1016/s0040-4039(98)01966-2
日期:1998.11
A survey of conjugate additions of Yamamoto organocopperreagents to N-enoyl-4-substituted oxazolidinones is reported. Diastereofacial selectivity is reversed for 4-phenyl and 4-benzyloxazolidinones of the same relative configuration. Alkenylcopper reagents demonstrate superior results in asymmetric additions using the 4-phenyloxazolidinone auxiliary.