Trimethylsilyketene dialkylacetals in organic synthesis: Reactions with alkyldiazoacetates
摘要:
The reaction of trimethylsilylketene dialkylacetals with alkyldiazoacetates in the presence of Cu(acac)(2) or Rh-2(OAc)(4) results in the formation of alkyl-2,2-dialkoxy-3-trimethylsilylcyclopropane-1-carboxylates 3-8. The cycloaddition proceeds stereoselectively, giving exclusively one of two possible diastereomers. Compounds 4 and 6 are transformed by reaction with LiAIH(4), to cyclopropylmethanols 9 and 10 in high yields. All compounds have been characterized by elemental analyses, H-1, C-13 NMR and IR spectroscopy.
Trimethylsilyketene dialkylacetals in organic synthesis: Reactions with alkyldiazoacetates
摘要:
The reaction of trimethylsilylketene dialkylacetals with alkyldiazoacetates in the presence of Cu(acac)(2) or Rh-2(OAc)(4) results in the formation of alkyl-2,2-dialkoxy-3-trimethylsilylcyclopropane-1-carboxylates 3-8. The cycloaddition proceeds stereoselectively, giving exclusively one of two possible diastereomers. Compounds 4 and 6 are transformed by reaction with LiAIH(4), to cyclopropylmethanols 9 and 10 in high yields. All compounds have been characterized by elemental analyses, H-1, C-13 NMR and IR spectroscopy.