Regioselective Formation of Tetrahydroselenophenes via 5-<i>exo</i>-<i>dig</i>-Cyclization of 1-Butylseleno-4-alkynes
作者:Rafaela M. Gai、Ricardo F. Schumacher、Davi F. Back、Gilson Zeni
DOI:10.1021/ol302919b
日期:2012.12.7
Results on the synthesis of tetrahydroselenophene derivatives from 1-butylseleno-4-alkynes by electrophilic cyclization using iodine as the electrophilic source are presented. This methodology was carried out via a simple process under mild reaction conditions providing the cyclized products in high yields. Electrophilic sources, such as PhSeBr, CuCl2, and CuBr2, were also used in this study. The
Alkyltitanium alkoxides generally serve as nucleophiles in reactions with carbonyl compounds and cross-coupling. Their application as reductants is known but remains underdeveloped. Here, we report that irradiation with visible light makes these organometallic compounds efficient reducing agents for the dehalogenation of 1,2- and 1,3-haloalcohols. This reaction was utilized for the reduction of epoxides
An efficient method for the alkynylation of oxiranes using alkynyl boranes
作者:Masahiko Yamaguchi、Ichiro Hirao
DOI:10.1016/s0040-4039(00)81416-1
日期:——
Boron trifluoride–tetrahydrofuran complex: a superior trigger for the Yamaguchi–Hirao alkylation of lithio-acetylides by epoxides
作者:Ann B Evans、David W Knight
DOI:10.1016/s0040-4039(01)01414-9
日期:2001.9
Use of (BF3THF)-T-. complex in place of the usual (BF3OEt2)-O-. analogue in the Yamaguchi-Hirao alkylation of lithio- acetylides 2 by monosubstituted epoxides 3 gives consistently superior isolated yields (ca. 90%) of homopropargylic alcohols 1. (C) 2001 Elsevier Science Ltd. All rights reserved.
Malinovskii,M.S.; Khmel',M.P., Journal of Organic Chemistry USSR (English Translation), 1967, vol. 3, p. 1748 - 1749