New and regioselective synthesis of 4-ylidene-tetronic acids by Lewis-acid catalyzed cyclization of 4-alkoxy-bis-(trimethylsiloxy)-1,3-diene with oxalyl chloride

被引:0
|
作者
Langer, P [1 ]
Eckardt, T [1 ]
机构
[1] Univ Gottingen, Inst Organ Chem, D-37077 Gottingen, Germany
关键词
butenolides; cyclizations; dianion synthons; oxalic acid; regioselectivity;
D O I
暂无
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A new approach for the synthesis of 4-ylidene-tetronic acids is reported which involves Me3SiOTf-catalyzed, regio- and stereoselective cyclization of 4-alkoxy-bis-(trimethylsiloxy)-1,3-dienes with oxalyl chloride and subsequent chemoselective deprotection of the 3-hydroxy-group.
引用
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页码:844 / 846
页数:3
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