Catalytic Addition Methods for the Synthesis of Functionalized Diazoacetoacetates and Application to the Construction of Highly Substituted Cyclobutanones
作者:Michael P. Doyle、Kousik Kundu、Albert E. Russell
DOI:10.1021/ol052003s
日期:2005.11.1
[reaction: see text] Methyl 3-(trialkylsilanyloxy)-2-diazo-3-butenoate undergoes Lewis acid-catalyzed Mukaiyamaaldol addition with aromatic and aliphatic aldehydes in the presence of low catalytic amounts of Lewis acids in nearly quantitative yields. Scandium(III) triflate is the preferred catalyst and, notably, addition proceeds without decomposition of the diazo moiety. Diazoacetoacetate products
Method for isolating an intestinal cholesterol binding protein
申请人:——
公开号:US20040126812A1
公开(公告)日:2004-07-01
The invention describes a method for isolating an intestinal protein which is able to bind cholesterol and/or cholesterol uptake inhibitors. Methods of identifying inhibitors of cholesterol uptake and related pharmaceuticals and methods of treatment also are described.
The Development of a Scalable, Chemoselective Nitro Reduction
作者:William P. Gallagher、Mark Marlatt、Robert Livingston、Susanne Kiau、Jale Muslehiddinoglu
DOI:10.1021/op3002239
日期:2012.10.19
We have demonstrated a scalable chemoselective reduction of a nitro functional group in the presence of an aryl imine using (NH4)(2)S/EtOH or hydrogenation (Sponge Nickel) to afford the corresponding amino-imines in moderate to excellent yields. Other reducible groups such as aryl halides, styryl olefins, and ether linkages Survived as well
Highly Selective Catalyst-Directed Pathways to Dihydropyrroles from Vinyldiazoacetates and Imines
作者:Michael P. Doyle、Ming Yan、Wenhao Hu、Luisa S. Gronenberg
DOI:10.1021/ja029745q
日期:2003.4.1
Copper-catalyzed reactions of vinyldiazoacetates with imines occur via a pathway in which the activated imine undergoes electrophilic addition to the vinyldiazo compound, whereas reactions catalyzed by rhodium(II) proceed through a metal carbene to an intermediate iminiumylide. Both pathways exhibit high stereoselectivities.