Synthesis of polycyclic cyclopropanecarboxylic acids and their esters based on catalytic cyclopropanation of 6,6-dimethylfulvene
作者:Yu. V. Tomilov、N. M. Tsvetkova、O. M. Nefedov
DOI:10.1007/bf02495405
日期:1997.3
Reactions of 6,6-dimethylfulvene with methyl diazoacetate in the presence of Cu compounds is accompanied by methoxycarbonylmethylenation of the endocyclic double bonds to give the corresponding mono- and diadducts in total yields of up to 85% with marked predominance of anti-isomers. The subsequent cyclopropanation of monoadducts with diazomethane in the presence of Pd compounds also involves the endocyclic double bond and gives esters of tricyclo[4.1.0.0(2,4)]heptanecarboxylic acid in high yields.
Molchanov; Stepakov; Kostikov, Russian Journal of Organic Chemistry, 1998, vol. 34, # 10, p. 1442 - 1445