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
Enantiomerically pure 2,2-dibromocyclopropanecarboxylic acids, simple chiral building blocks
作者:Mark S. Baird、Peter Licence、Viacheslav V. Tverezovsky、Ivan G. Bolesov、William Clegg
DOI:10.1016/s0040-4020(99)00048-4
日期:1999.2
Simple chiralbuildingblocks 1-(R)- and 1-(S)-2,2-dibromocyclopropanecarboxylic acids and 2-(R)-bromo-1-(S)-cyclopropanecarboxylic acids and their 1-methyl analogues, have been obtained on a preparatively useful laboratory scale.