Regioselective dehydration in cyclic system with triphenylphosphine-azodicarboxylate
摘要:
The regioselective dehydration of cyclohexanol derivatives was achieved by using the Mitsunobu reagent system. The reaction undergoes under mild and neutral conditions. The observed regioselectivity was explained by considering the importance of the orientation of the leaving group at the elimination stage.
double bond migration, hydrogenation of which leads to the products. For the carvomenthene epoxides the results are similar to those found in the 4-t-butyl series with competition between cisaddition and trans addition of hydrogen. The presence of the isopropenyl group leads to slower reactionrates in comparison with t-butyl analogues.