Rhodium-catalyzed domino silylformylation of enynes involving carbocyclization
作者:Yukimasa Fukuta、Isamu Matsuda、Kenji Itoh
DOI:10.1016/s0040-4039(99)00849-7
日期:1999.6
1,6-Enyne derivatives readily react with a hydrosilane and carbon monoxide in the presence of a catalytic amount of a rhodium complex to give 5-membered ring products containing a silylmethylene group and a formylmethyl group on the adjacent carbon atoms.
Enantioselective Cyclization/Hydrosilylation of 1,6-Enynes Catalyzed by a Cationic Rhodium Bis(phosphine) Complex
作者:Harinath Chakrapani、Cong Liu、Ross A. Widenhoefer
DOI:10.1021/ol027196n
日期:2003.1.1
[reaction: see text] Reaction of 4,4-dicarbomethoxy-1-octene-6-yne (1) with triethylsilane and a catalytic 1:1 mixture of [Rh(COD)(2)](+) SbF(6)(-) and (R)-BIPHEMP (5 mol %) at 70 degrees C for 90 min gave (Z)-1,1-dicarbomethoxy-3-(1-triethylsilyl)ethylidene-4-methylcyclopentane (2) in 81% isolated yield with 98% de and 92% ee.
[GRAPHICS]Reaction of 1,6-enynes with a hydrosilane in the presence of immobilized cobalt/rhodium bimetallic nanoparticles gives 2-methyl-1-silylmethylidene2-cyclopentanes in the absence of carbon monoxide and 2-formylmethyl-1-silylmethylidene-2-cyclopentanes under 1 atm of carbon monoxide, respectively.