Asymmetric synthesis of palitantin from the (5R)-tert-butyldimethylsiloxy-2-cyclohexenone

被引:20
作者
Hareau, G [1 ]
Koiwa, M [1 ]
Hanazawa, T [1 ]
Sato, F [1 ]
机构
[1] Tokyo Inst Technol, Dept Biomol Engn, Midori Ku, Kanagawa 2268501, Japan
基金
日本学术振兴会;
关键词
asymmetric synthesis; copper; copper compounds; cyclohexenones; hydroxylation;
D O I
10.1016/S0040-4039(99)01549-X
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
(+)-Palitantin (2) has been synthesized in 25% overall yield from the (5R)-tert-butyldimethylsiloxy-2-cyclohexenone [(R)-1] where a remarkable diastereoselective cat. OsO4 cis-dihydroxylation of (R)-1 furnished the precursor of the optically pure (5R,6R)-bis-trimethylsiloxy 2-cyclohexenone (7) which underwent highly selectively the 1,4-addition reaction of the 1,3-heptadienyl cyanocuprate to give, after trapping of the corresponding copper enolate with formaldehyde, the target compound. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:7493 / 7496
页数:4
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