Synthesis of azaspiro[4.5]decane systems by oxidative cyclization of olefinic precursors
作者:María J. Martín-López、Francisco Bermejo
DOI:10.1016/s0040-4020(98)00746-7
日期:1998.10
The synthesis of 6-benzyloxycarbonyl-1-oxa-6-azaspiro[4.5]decan-2-one (17) and 6-benzyloxycarbonyl-1,6-diazaspiro[4.5]decan-2-one (18) from the D,L-pipecolic acid derivative 10, is described. The synthesis of (±)-6-benzyl-3-methyl-1,6-diazaspiro[4.5]dec-3-ene-2,7-dione (29), the spiro structural unit of (±)-pandamarine (8) has been achieved by oxidative cylization of the (Z) and (E) isomers of 5-(N-
由D,合成6-苄氧基羰基-1-氧杂-6-氮杂螺[4.5]癸-2-(17)和6-苄氧基羰基-1,6-二氮杂螺[4.5]癸-2-(18),描述了L-哌酸衍生物10。(±)-6-苄基-3-甲基-1,6-二氮杂螺[4.5] dec-3-ene-2,7-二酮(29)((±)-pandamarine的螺结构单元)的合成(8)已通过氧化环化5-(N-苄基-4-羧酰胺基丁烯)-3-甲基-3-吡咯啉-2-酮(25)和(26)的(Z)和(E)异构体而实现。还讨论了分子内环化过程中获得的立体选择性。