Electronic effect on the regioselectivity in the ring opening of para-substituted phenyloxiranes by acetylides
作者:Mitsuru Shindo、Tomoyuki Sugioka、Kozo Shishido
DOI:10.1016/j.tetlet.2004.10.049
日期:2004.12
The electronic effect on the regioselectivity in the alkynylation of phenyloxiranes was investigated using three kinds of metal acetylides. BF3 mediated lithium acetylide provided either the alpha- or beta-alkynylated products by controlling the effect of the para-substituents of the phenyloxiranes. LiClO4 mediated lithium acetylide and titanium acetylide, on the other hand, afforded predominantly the beta- and alpha-products, respectively. (C) 2004 Elsevier Ltd. All rights reserved.