π-Face selective azaspirocyclization of ω-(methoxyphenyl)-N-methoxyalkylamides

被引:54
作者
Wardrop, DJ [1 ]
Burge, MS [1 ]
Zhang, W [1 ]
Ortíz, JA [1 ]
机构
[1] Univ Illinois, Dept Chem, Chicago, IL 60607 USA
基金
美国国家科学基金会; 美国国家卫生研究院;
关键词
D O I
10.1016/S0040-4039(03)00227-2
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A novel method for the stereoselective preparation of 1-azaspiranes is described. Treatment of alpha- and beta-substituted 3-(methoxyphenyl)-N-methoxypropionamides 1 with phenyliodine(III) bis(trifluoroacetate) initiates efficient azaspirocyclization, via a putative N-acylnitrenium ion intermediate, to provide cyclohexa-2,5 and 2,4-dienone spirolactams 8 and 11 with good pi-facial selectivity. Furthermore, a preliminary study indicates that this strategy is also amenable to the preparation of 1-azaspiro[5.5] undeca-2,5-dienones. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2587 / 2591
页数:5
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