ENANTIOSELECTIVE RU-MEDIATED SYNTHESIS OF (-)-INDOLIZIDINE-223AB

被引:60
作者
TABER, DF
DEKER, PB
SILVERBERG, LJ
机构
[1] Department of Chemistry and Biochemistry, University of Delaware, Newark
关键词
D O I
10.1021/jo00048a037
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Triphenylphosphine/CCl4-mediated cyclization of amino alcohol 17 proceeded smoothly, with single inversion, to provide (-)-indolizidine 223AB 4. Amino alcohol 17 was prepared by thermolysis of azide 16, followed by DIBAL reduction of the intermediate imine. Symchiral aldehyde 12 and phosphonium salt 15, precursors to 16, were prepared by BINAP.Ru*-mediated hydrogenation of the corresponding beta-keto esters. A simplified procedure allows this hydrogenation to be carried out in a Parr shaker, at 80-degrees-C and 50 psig of H-2.
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页码:5990 / 5994
页数:5
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