Organomanganese (II) reagents XXIII: Manganese-catalyzed acylation of organomagnesium compounds by car☐ylic acid chlorides
作者:Ge´rard Cahiez、Blandine Laboue
DOI:10.1016/s0040-4039(00)60104-1
日期:1992.7
reagents react with car☐ylic chlorides, in THF between 0 and 10°C, to give the corresponding ketones in highyields. The scope of the reaction is very large; alkyl, alkenyl and aryl magnesium reagents have been used successfully. The selectivity of the reaction allows to prepare various fonctionalized ketones from car☐ylicacid chlorides bearing a functional group (Cl, Br, ester nitrile and even a ketone)
在催化量的氯化锰(3%MnCl 4 Li 2)的存在下,有机镁试剂在0至10°C之间的THF中与羧基氯化物反应,以高收率得到相应的酮。反应范围非常大。烷基,烯基和芳基镁试剂已成功使用。反应的选择性允许从带有官能团(Cl,Br,酯腈甚至是酮)的汽车☐酰氯制备各种功能化的酮。
Tetrazole derivatives, and anti-ulcer composition containing the same
申请人:Otsuka Pharmaceutical Company, Limited
公开号:US04372953A1
公开(公告)日:1983-02-08
Tetrazole derivatives of the formula: ##STR1## wherein R.sup.1 is a lower alkykl, phenyl or a group of the formula: --S(O).sub.l --A--(X).sub.m --R.sup.3, and R.sup.2 is hydrogen, a lower alkyl, phenyl or a cycloalkyl when R.sup.1 is the group --S(O).sub.l --A--(X).sub.m --R.sup.3, or R.sup.2 is a group of the formula: --B--CO--R.sup.4 when R.sup.1 is a lower alkyl or phenyl and a pharmaceutically acceptable salt thereof, which have prophylactic or therapeutic activities against peptic and/or duodenal ulcers and are useful as an anti-ulcer drug; processes for the preparation of the tetrazole derivatives; and pharmaceutical composition containing said tetrazole derivatives.
carbonyl group, cyano group) in an alkyl halide facilitates its cross-coupling reaction with various diorganozincs in the presence of Ni(acac)(2) (7.5-10 mol % in THF/NMP mixtures). These results were used to develop a new general cross-coupling reaction between functionalized diorganozincs and alkyliodides using m- or p-trifluoromethylstyrene as a reaction promotor and Ni(acac)(2) as a catalyst (7.5-10
Many 1-substituted 4-(5-tetrazolyl)thio-1-butanones were synthesized and tested for antiulcer activity against acetic acid-induced gastric ulcer in rats. These compounds were prepared by the reaction of 5-mercaptotetrazoles and 4-halogeno-1-butanones. Among them, 1-cyclohexyl-4-(1-phenyl-5-tetrazolyl)thio-1-butanone (VIIIp) was found to have the most potent activity. The structure-activity relationships
A catalytic asymmetric intramolecular homologation of simple ketones with α‐diazoesters was firstly accomplished with a chiral N,N′‐dioxide–Sc(OTf)3 complex. This method provides an efficient access to chiral cyclic α‐aryl/alkyl β‐ketoesters containing an all‐carbon quaternary stereocenter. Under mild conditions, a variety of aryl‐ and alkyl‐substituted ketone groups reacted with α‐diazoester groups