3-methyl-2-trimethylsilyloxy-1-butene;3-methyl-2-(trimethylsilanyloxy)-1-butene;3-methyl-2-trimethylsilyloxybut-1-ene;trimethylsilyl enol ether of 3-methyl-2-butanone;(1-isopropyl-vinyloxy)-trimethyl-silane;trimethyl-(2-methyl-1-methylene-propoxy)-silane;3-methyl-2-trimethylsilanyloxy-but-1-ene;trimethyl(3-methylbut-1-en-2-yloxy)silane
The Exceptional Chelating Ability of Dimethylaluminum Chloride and Methylaluminum Dichloride. The Merged Stereochemical Impact of α- and β-Stereocenters in Chelate-Controlled Carbonyl Addition Reactions with Enolsilane and Hydride Nucleophiles
作者:David A. Evans、Brett D. Allison、Michael G. Yang、Craig E. Masse
DOI:10.1021/ja011337j
日期:2001.11.1
beta-disubstituted aldehydes concludes that the syn aldehyde diastereomer possesses the arrangement of stereocenters wherein the alpha- and beta-substituents impart a reinforcing facial bias upon the aldehyde carbonyl. Aldol reactions of syn aldehydes were thus observed to proceed with uniformly excellent diastereofacial selectivity. Aldol reactions of the corresponding anti aldehydes containing opposing
NEW AMINOTHIAZOLES AS FBPASE INHIBITORS FOR DIABETES
申请人:Hebeisen Paul
公开号:US20090143448A1
公开(公告)日:2009-06-04
Compounds of formula (I)
as well as pharmaceutically acceptable salts and esters thereof, wherein R
1
to R
3
have the significance given in claim
1
and which can be used in the form of pharmaceutical compositions.
rate-determining C−C bond formation. The nucleophilic reactivities span over a range of 108 from the vinylethers 1a,x as the least reactivecompounds (comparable to allylsilanes) to the highly nucleophilic silyl ketene acetal 1u (comparable to enamines). Linear free enthalpy relationships are used to compare the reactivities of these compounds with those of other aliphatic and aromatic π-nucleophiles.
A Convenient Regioselective Synthesis of Mannich Bases
作者:C. Rochin、O. Babot、J. Dunogues、F. Duboudin
DOI:10.1055/s-1986-31742
日期:——
A new, convenient regioselective process for aminomethylation of ketones is reported, involving the in situ formation of silyl enol ethers and iminium salts.
A new, practical route to enoxysilanes is described from simple enolizable aldehydes or ketones, using the trimethylchlorosilane-sodium iodide—tertiary amine reagent in acetonitrile. From certain aldehydes, an onium intermediate has been isolated. A conformational study of this onium intermediate and a thermal unimolecular syn-elimination process may explain the stereoselectivity of the reaction. Such