the synthesis of alkenyl halides are described under microwave-assisted conditions. The reaction proceeds through the condensation between sec-alcohols and terminalacetylenes and regeoselective hydro halogenation across the triple bond in the presence of simple and commercially available zinc halides. Three halide sources could successfully be employed to give a diverse range of alkenyl halide products
Boron Trihalide Mediated Substitution of Hydroxyl Groups with Alkenyl, Alkynyl, and Allyl Moieties
作者:George Kabalka、Scott Borella、Min-Liang Yao
DOI:10.1055/s-2007-990816
日期:2008.1
The coupling of alcohols with alkenyl- and alkynylboron dihalides with high olefin stereoselectivity is described. The reaction provides a facile route to internal acetylenes. Notably, the allylation of propargylic alcohols mediated by borontrichloride proceeds smoothly at room temperature and gives excellent regioselectivity.
Fe powder catalyzed highly efficient synthesis of alkenyl halides via direct coupling of alcohols and alkynes with aqueous HX as exogenous halide sources
作者:Yong-Rong Yang、Qiang Zhang、Feng-Tian Du、Jian-Xin Ji
DOI:10.1016/j.tet.2015.04.065
日期:2015.6
A simple and efficient catalytic method for the synthesis of alkenylhalides via direct coupling of alcohols and alkynes using aqueous HX (X=Cl, Br) as halide sources has been developed under mild conditions in the presence of Fe powder (1 mol %). In comparison with the high loading of FeX3 in previously reported protocols, the present approach provides a remarkable attractive methodology to a diverse
New and Efficient Iron Halide Mediated Synthesis of Alkenyl Halides through Coupling of Alkynes and Alcohols
作者:Srijit Biswas、Sukhendu Maiti、Umasish Jana
DOI:10.1002/ejoc.200900104
日期:2009.5
simple, and straightforward one-pot reaction of alkynes with various alcohols in the presence of iron salts (FeCl3 and FeBr3) was described to yield the corresponding alkenyl halides with complete regioselectivity and highstereoselectivity. The reaction is high yielding and works under mild conditions. The iron salts act as Lewis acids and a source of halides. The reaction tolerates a wide variety of functional
Substitution of Benzylic Hydroxyl Groups with Vinyl Moieties Using Vinylboron Dihalides
作者:George W. Kabalka、Min-Liang Yao、Scott Borella、Zhong-Zhi Wu
DOI:10.1021/ol050778v
日期:2005.7.1
[reaction: see text] Substitution of benzylic hydroxyl groups with vinyl moieties using vinylboron dihalides has been achieved. The reaction provides a novel method for preparing stereodefined alkenyl halides.