A Straightforward Homologation of Carbon Dioxide with Magnesium Carbenoids en Route to α-Halocarboxylic Acids
作者:Serena Monticelli、Ernst Urban、Thierry Langer、Wolfgang Holzer、Vittorio Pace
DOI:10.1002/adsc.201801614
日期:2019.3.5
homologation of carbon dioxide with stable, (enantiopure) magnesium carbenoids constitutes a valuable method for preparing α‐halo acid derivatives. The tactic features a high level of chemocontrol, thus enabling the synthesis of variously functionalized analogues. The flexibility to generate magnesium carbenoids through sulfoxide‐, halogen‐ or proton‐ Mg exchange accounts for the wide scope of the reaction.
A new procedure for one-carbon homologation of carbonyl compounds to α-chloroketones is described. Addition of the carbanion of dichloromethyl phenyl sulfoxide with ketones and aldehydes gave the adducts, chloro alcohols, in good yields. Treatment of the chloro alcohols with EtMgBr or lithium diisopropylamide gave one-carbon homologated α-chloroketones via β-oxido carbenoid rearrangement in moderate
3,4-DIHYDRO-2H-BENZO[1,4]OXAZINE AND THIAZINE DERIVATIVES AS CETP INHIBITORS
申请人:Kuo Gee-Hong
公开号:US20070265252A1
公开(公告)日:2007-11-15
The invention is directed to compounds of Formula (I) described herein useful as CETP inhibitors, compositions containing them, and methods of using them.
Syntheses of (<i>R</i>)- and (<i>S</i>)-2- and 6-Fluoronorepinephrine and (<i>R</i>)- and (<i>S</i>)-2- and 6-Fluoroepinephrine: Effect of Stereochemistry on Fluorine-Induced Adrenergic Selectivities
作者:Shou-fu Lu、B. Herbert、Günter Haufe、Klaus Wilhelm Laue、William L. Padgett、O. Oshunleti、John W. Daly、Kenneth L. Kirk
DOI:10.1021/jm990599h
日期:2000.4.1
Several routes to the enantiomers of fluoronorepinephrines (1) and fluoroepinephrines (2) were explored. A catalytic enantioselective oxazaborolidine reduction and a chiral (salen)Ti(IV) catalyzed asymmetric synthesis of silyl cyanohydrins proved efficacious in the key stereo-defining steps of two respective routes. Binding studies of the catecholamines with alpha(1)-, alpha(2)-, beta(1)-, and beta(2)-adrenergic
Reactions of organoboranes with carbanions bearing three potential leaving groups: unusual processes, products and mechanisms
作者:Basil A. Saleh、Keith Smith、Mark C. Elliott、D. Heulyn Jones、Benson M. Kariuki、Gamal A. El Hiti
DOI:10.1016/j.tet.2016.09.005
日期:2016.11
α-chloroalkyl phenyl sulfoxides or reacted with aldehydes to aldol-like products. With X=SO2Ph, the major product was the corresponding α,α-dichloroalkyl phenyl sulfone, apparently formed through a redox reaction. With X=S(O)(NMe)Ph, products of three intramolecular alkyl migrations were obtained with unhindered trialkylboranes. Attempts have been made to gain understanding of the sulfoxide process by investigating