Reactions de Mitsunobu des acides hydroxy-3 trimethyl-2,2,3 butyrique et threo- et erythro-diphenyl-3,4 hydroxy-3 methyl-2 butyriques et desoxygenation par la tri-phenylphosphine des peroxylactones correspondantes
反应 de Mitsunobu des acides hydroxy-3 trimethyl-2,2,3 butyrique et threo- et erythro-diphenyl-3,4 hydroxy-3methyl-2 butyriques et deoxygenation par la tri-phenylphosphine des peroxylactones相应物
Cobalt-Catalyzed Benzylzincation of Alkynes
作者:Kei Murakami、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1002/chem.201001061
日期:——
Carbometalation: Cobalt salts catalyze benzylzincation of alkynes to afford benzylated multisubstituted alkenes with high regio‐ and stereoselectivity. The scope of the reaction is wide enough to apply unfunctionalized alkynes as well as arylacetylenes. The reaction offers a new route to the regio‐ and stereoselective synthesis of an estrogen receptor antagonist (see scheme).
A straightforward methodology for the synthesis of anti‐Markovnikov‐type alcohols is presented. By using a specific cobalt triphos complex in the presence of Zn(OTf)2 as an additive, the hydrogenation of epoxides proceeds with high yields and selectivities. The described protocol shows a broad substrate scope, including multi‐substituted internal and terminal epoxides, as well as a good functional‐group
Stereoselective synthesis of tri- and tetrasubstituted functionalized olefins and newphosphates bearing functionalized cyclic substituent has been developed using thiophosphates and selenophosphates as key intermediates.