Synthesis and reactions of terpenyl diselenides functionalized with phenyl and naphthyl groups
摘要:
An efficient methodology for the synthesis of chiral terpenyl diselenides functionalized with phenyl and naphthyl groups has been developed. Using the reaction of sodium diselenide with terpenyl tosylates and chlorides, the corresponding diselenides derived from 8-phenyl menthol and isopinocampheol modified at the 10-position were obtained. Diselenides were transformed into electrophilic selenium reagents and tested in the asymmetric selenenylation of styrene. The effect of aryl groups on the enantioselectivity of the addition reaction was examined. (C) 2016 Elsevier Ltd. All rights reserved.
A convenient method for the synthesis of optically active dialkyl diselenides derived from bicyclic terpenes functionalized with hydroxy, etheral, sulfide, and selenide groups is described. The diselenides were used for a synthesis of chiral electrophilic selenium reagents, then in the asymmetric selenenylation of styrene and selenocyclization with o-allylphenol. The influence of nonbonding selenium-heteroatom
Selenocyclization with the use of the monoterpene diselenides from menthane, carane and pinane groups has been studied. The conditions for asymmetric selenocyclization have been optimized. It has been established that the best enantiomeric excesses were obtained in the case of selenocyclization for the unsubstituted alkyl diselenides with (+)-dineomenthyl diselenide. The results of the selenocyclization of the (+)-dineomenthyl diselenide with the unsaturated alcohols and acids are presented. (C) 2007 Elsevier Ltd. All rights reserved.