Enantioselective Diels–Alder Approach to Angucyclinones from(S)-2-(p-Tolylsulfinyl)-1,4-naphthoquinone and Substituted Racemic Vinylcyclohexenes
作者:M. Carmen Carreño、Antonio Urbano、Jean Fischer
DOI:10.1002/anie.199716211
日期:1997.8.18
Synthetic Studies of the Angucycline Antibiotics. Stereocontrolled Assembly of the SF 2315B Ring System
作者:Kyungjin Kim、Yu Guo、Gary A. Sulikowski
DOI:10.1021/jo00126a043
日期:1995.10
The stereocontrolled assembly of epoxy quinol 2 is described. Diels-Alder cycloaddition between 2-bromo-5-acetoxyjuglone (5) and 3-[(triisopropylsilyl)oxy]-1-vinylcyclohexene (6c) followed by saponification provided quinone 11b in good overall yield. Oxygenation of a tetrahydrofuran solution of 11b in the presence of tetrabutylammonium fluoride resulted in the production of epoxy alcohols alpha-12b and alpha-13b. Epoxy alcohol alpha-12b was converted to epoxy quinol 2 in five steps. A key transformation of the latter reaction sequence was a C1 hydroxyl-directed reduction of the C12 keto group (20 --> 21). The assigned structure of 2 was confirmed by single-crystal X-ray analysis.
Synthetic studies of the angucycline antibiotics. Reaction of a quinone methide produced from a benz[a]anthracene with molecular oxygen
Molecular oxygen-based procedures for the stereocontrolled introduction of oxygen functionality present in the antitumor antibiotics aquayamycin (1) and SF 2315B (2) are described.
Intermolecular Diels-Alder reactions of 3-vinylcyclohex-2-en-1-ol and a silyl ether derivative
作者:Lucjan Strekowski、Sukbin Kong、Merle A. Battiste