Reactions of zinc enolates derived from 1-aryl-2,2-di-bromoalkanones with 2-acyl-3H-benzo[f]chromen-3-ones, 6-bromo-2-oxochromene-3-carboxamides, and 3-oxo-3H-benzo-[f]chromene-2-carboxamides
作者:V. V. Shchepin、M. M. Kalyuzhnyi、P. S. Silaichev、N. Yu. Russkikh、R. V. Shchepin、M. A. Ezhikova、M. I. Kodess
DOI:10.1007/s11178-005-0019-z
日期:2004.9
Zinc enolates derived from substituted 1-aryl-2,2-dibromoalkanones reacted with 2-acyl-3H-benzo-[f]chromen-3-ones to give 1-alkyl-1-aroyl-1a-acyl-1a, 9c-dihydro-1H-3-oxacyclopropa[c]phenanthren-2-ones which were formed as a single stereoisomer. Reactions of the same zinc enolates with 6-bromo-2-oxo-chromene-3-carboxamides (piperidides and morpholides) afforded 1-aroyl-6-bromo-1-alkyl-1a-piperidino-(morpholino)carbonyl-1a,7b-dihydrocyclopropa[c]chromen-2-ones with high stereoselectivity. Likewise, 1-benzoyl-1-methyl-1a-morpholinocarbonyl-1a, 9c-dihydro-1H-3-oxacyclopropa[c]phenanthren-2-one was obtained by reac-tion with 3-oxo-3H-benzo[f]chromene-2-carboxylic acid morpholide.
由取代的1-芳基-2,2-二溴烷酮衍生的锌醇盐与2-酰基-3H-苯并[f]色烯-3-酮反应,生成1-烷基-1-酰基-1a-酰基-1a, 9c-二氢-1H-3-氧杂环丙烷[c]菲-2-酮,以单一立体异构体的形式形成。相同的锌醇盐与6-溴-2-氧-色烯-3-氨基酸酯(哌啶类和吗啉类)反应,得到1-酰基-6-溴-1-烷基-1a-哌啶(吗啉)羰基-1a, 7b-二氢环丙烷[c]色烯-2-酮,具有高立体选择性。同样,1-苯甲酰-1-甲基-1a-吗啉羰基-1a, 9c-二氢-1H-3-氧杂环丙烷[c]菲-2-酮是通过与3-氧-3H-苯并[f]色烯-2-羧酸吗啉的反应获得的。