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INTRAMOLECULAR CYCLOPROPANATION - STEREOSPECIFIC SYNTHESIS OF (E)-1-AMINOCYCLOPROPANE-1-CARBOXYLIC AND (Z)-1-AMINOCYCLOPROPANE-1-CARBOXYLIC ACIDS
被引:50
作者:
KOSKINEN, AMP
MUNOZ, L
机构:
[1] Department of Chemistry, University of Oulu, Linnanmaa
[2] Departamento de Quimica Pura y Aplicada, Universidad de Vigo, Galicia
关键词:
D O I:
10.1021/jo00056a020
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
tert-Butyl-substituted allyl malonates, prepared in two steps from malonic acid, are diazotized in high yields. The diazomalonates 7 undergo a stereospecific copper(I)-catalyzed cyclopropanation to give 1-(tert-butoxycarbonyl)-3-oxa-2-oxobicyclo[3.1.0]hexanes 8 which can be converted to the protected (E)- or (Z)-1-aminocyclopropane-1-carboxylic acids 10 or 15 via Curtius- or Hoffmann-type rearrangements, respectively. The sequences are short (six steps from malonic acid) and proceed with good overall yields (20-40% overall from malonic acid) The free amino acids 12 and 18 can be liberated in two steps.
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页码:879 / 886
页数:8
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