STEREOSELECTIVE CONVERGENT SYNTHESIS OF HYDROAZULENES VIA AN INTERMOLECULAR CYCLOPROPANATION COPE REARRANGEMENT

被引:34
|
作者
CANTRELL, WR [1 ]
DAVIES, HML [1 ]
机构
[1] WAKE FOREST UNIV,DEPT CHEM,WINSTON SALEM,NC 27109
来源
JOURNAL OF ORGANIC CHEMISTRY | 1991年 / 56卷 / 02期
关键词
D O I
10.1021/jo00002a044
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Rhodium(II) acetate catalyzed decomposition of vinyldiazomethane 1 to a vinylcarbenoid intermediate in the presence of oxygenated dienes led to the direct formation of hydroazulenes 7, 13, and 15-19. The 3 + 4 annulation proceeds by a tandem cyclopropanation/Cope rearrangement sequence. The cyclopropanation is highly stereoselective, favoring the formation of cis-divinylcyclopropanes. Due to the boat transition state required for the Cope rearrangement of cis-divinylcyclopropanes, the hydroazulenes are formed with predictable stereocontrol.
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页码:723 / 727
页数:5
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