Metal hydride reductions of unsymmetrically substituted cyclic anhydrides attached to strained ring systems
作者:Margaret M. Kayser、Judith Salvador、Peter Morand、H. G. Krishnamurty
DOI:10.1139/v82-178
日期:1982.5.15
reversal in regioselectivity is observed in the metalhydridereduction of unsymmetrical cyclic anhydrides such as 2,3, and 4 compared to cyclic anhydrides attached to bridged ring systems (e.g. 1). The synthesis of model cyclic anhydrides attached to strained rings is described and the ratios of isomeric lactones obtained upon reduction with metalhydride are reported. On the basis of theoretical calculations
Versatile Synthesis of Cyclopropanecarboxylic Acid Derivatives by the Ni(CO)<sub>4</sub>-Induced Reductive Carbonylation Reaction of<i>gem</i>-Dibromocyclopropanes
Reductive carbonylation of gem-dibromocyclopropanes was achieved by treatment with tetracarbonylnickel in the presence of alcohols, amines, thiols, or imidazole in DMF leading to the corresponding cyclopropanecarboxylic acid derivatives, respectively. Use of disulfides as an initial nucleophile resulted in carbonylation with sulfenylation at the geminal position. This method was applied to the intramolecular