Diiodosamarium an excellent catalyst precursor for Aldolisation and Michael reactions.
作者:Pierre Van de Weghe、Jacqueline Collin
DOI:10.1016/s0040-4039(00)79253-7
日期:1993.6
SmI2 is the precursor of efficient catalysts for the aldolisationreactions of aldehydes and ketones with enol silanes. α,β-unsaturated ketones give 1,4-addidtions selectively.
Mukaiyama aldol and Michael reactions catalyzed by lanthanide iodides
作者:Nicolas Giuseppone、Pierre Van de Weghe、Mohamed Mellah、Jacqueline Collin
DOI:10.1016/s0040-4020(98)00791-1
日期:1998.10
Samariumdiiodide is an efficient catalyst precursor which allows the formation of condensation products between various carbonylcompounds and ketene silyl acetals or enoxysilanes. With α,β-unsaturated carbonylcompounds, 1,2- or 1,4-additions are observed according to the structure of the substrate. α,β-Unsaturated ketones yield to enoxysilanes by selective Michael additions. Aldol poducts are isolated
Homogeneous catalysis. A transition metal based catalyst for the Mukaiyama crossed-aldol reaction and catalyst deactivation by electron transfer.
作者:William Odenkirk、John Whelan、B. Bosnich
DOI:10.1016/0040-4039(92)89017-7
日期:1992.9
The cationic complex [Ru(salen)(NO)H2O]SbF6 is intrinsically a powerful catalyst for the Mukaiyama crossed-aldol reaction at 25°C in nitromethane solutions and at very low catalyst loadings but, for some reactions, electron transferfrom the silylenolether to the ruthenium catalyst can occur which leads to catalyst deactivation.
Photosensitized electron transfer catalysis of the Mukaiyama aldol reaction by monocationic N21,N22-bridged porphyrins
作者:Ken-ichi Wada、Mari Yamamoto、Jun-ichiro Setsune
DOI:10.1016/s0040-4039(99)00255-5
日期:1999.4
enol silanes. A small amount (0.13 mol %) of N21,N22-bridged porphyrin hydroperchlorates catalyzed aldolreaction of aldehydes and ketones with enol silanes under the irradiation of visible light. The phlorin intemediate plays a key role in this photosensitized catalysis of the Mukaiyamaaldolreactions.
N 21,N 22桥连的卟啉氢盐酸盐通过单电子转移的方式转化为单阳离子的N 21,N 22桥连的N 23烷基膦,然后在烯醇硅烷存在下用可见光照射时进行自由基偶联。少量(0.13 mol%)的N 21,N 22桥连的卟啉氢高氯酸盐在可见光的照射下催化醛和酮与烯醇硅烷的醇醛缩醛反应。phlorin中间体在Mukaiyama aldol反应的光敏催化中起关键作用。
Homogeneous catalysis. [TiCp2(CF3SO3)2] and [ZrCp2(CF3SO3)2THF], fast and efficient catalysts for the Mukaiyama cross-aldol reaction
作者:T.Keith Hollis、N.P. Robinson、B. Bosnich
DOI:10.1016/s0040-4039(00)79005-8
日期:1992.10
The catalysts [TiCp2(CF3SO3)2] and [ZrCP2(CF3SO3)2THF] are fast and efficient catalysts for the Mukaiyama cross-aldol reaction involving both ketones and aldehydes and the catalysis is promoted by binding of the carbonyl group to the metal after dissociation of triflato ligands.