A wide variety of 3-iodobenzo[b]furans were readily prepared by iodocyclization of 2-alkynyl-1-(1-ethoxyethoxy) benzenes with the I(Coll)(2)PF6-BF3 center dot OEt2 combination. Aryl-, vinylic-, and alkyl-substituted alkynes undergo iodocyclization in good to excellent yields. The mechanism of the reaction is also discussed.
Regio- and Stereoselective Multisubstituted Enol Ester Synthesis
作者:Noriko Okamoto、Yoshihisa Miwa、Hideki Minami、Kei Takeda、Reiko Yanada
DOI:10.1021/jo201609r
日期:2011.11.4
Regio- and stereoselective cohalogenation of alkynes with NXS (X = Br, I) was achieved, and the stereoselectivity of the resulting alkenes was dependent on the substituent on the alkyne. Cohalogenation and successive cross-coupling gave multisubstituted enol esters in a one-pot process.