Metal exchange between an electrogenerated organonickel species and zinc halide: application to an electrochemical, nickel-catalyzed Reformatsky reaction
摘要:
The mechanism of the electroreductive coupling of alpha-chloro esters or alpha-chloro nitriles with carbonyl compounds by the means of a sacrificial zinc anode and a nickel catalyst was elucidated by electroanalytical techniques. The mechanism involved reduction of a Ni(II) complex to a Ni(0) complex, oxidative addition of the alpha-chloro ester to the Ni(0) complex, and a Zn(II)/Ni(II) exchange, leading to an organozinc Reformatsky reagent. The electrosynthesis of various beta-hydroxy esters, beta-hydroxy nitriles, and 2,3-epoxy esters was successfully achieved under extremely mild conditions.
Die Gasphasen-Flussthermolyse von 1-Isobutenyl- und 2-Methylphenyl-alkinyl-ketonen. Eine Synthese von Methylenomycin B
作者:Manuel Koller、Martin Karpf、Andr� S. Dreiding
DOI:10.1002/hlca.19860690306
日期:1986.5.7
The Gas-Flow Thermolysis of 1-Isobutenyl Alkynyl and 2-Methylphenyl Alkynyl Ketones. Synthesis of Methylenomycin B
1-异丁烯基炔基和2-甲基苯基炔基酮的气流热解。甲基霉素B的合成
Antihypercholesterolemic alkylene compounds
申请人:Bristol-Myers
公开号:US05011947A1
公开(公告)日:1991-04-30
Compounds of the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each are independently hydrogen, halogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy or trifluoromethyl; R is C.sub.1-7 alkyl, C.sub.3-6 cycloalkyl, fluoromethyl, difluoromethyl, trifluoromethyl; A is ##STR2## R.sup.5 is hydrogen, a hydrolyzable ester group or a cation to form a non-toxic pharmaceutically acceptable salt, are novel antihypercholesterolemic agents which inhibit cholesterol biosynthesis. Intermediates and processes for their preparation are disclosed.