The synthesis of 3,5,6-trichloropyridin-2-ol via the CuCl-catalyzed reaction of trichloroacetyl chloride and acrylonitrile under both pressure and atmospheric conditions and the hydrolysis of the reaction mixture were reinvestigated. The products and byproducts formed in each case, before the hydrolysis step, were characterized, and the factors causing their formation are discussed. It was found that
Reported herein is a visible‐light‐mediated radical approach to the α‐alkylation of ketones. This method exploits the ability of a nucleophilic organocatalyst to generate radicals upon SN2‐based activation of alkyl halides and blue light irradiation. The resulting open‐shell intermediates are then intercepted by weakly nucleophilic silyl enol ethers, which would be unable to directly attack the alkyl
Vicarious nucleophilic substitution of hydrogen in nitroderivatives of five-membered heteroaromatic compounds
作者:Mieczyslaw Makosza、Ewa Kwast
DOI:10.1016/0040-4020(95)00445-e
日期:1995.7
Nitro derivatives of thiophene, furan and pyrrole react with carbanions containing leaving groups giving products of replacement of hydrogen with functionalized alkyl substituents. Many specific features of this reaction are discussed.
Novel substituted benzamides of the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and A are as defined herein are useful in the treatment of emesis, and particularly chemotherapy-induced emesis in cancer patients. Some of the compounds are also useful in disorders relating to impaired gastric motility.
Naphthyridine compounds and their use as inhibitors of HPK1 are described. The compounds are useful in treating HPK1-dependent disorders and enhancing an immune response. Also described are methods of inhibiting HPK1, methods of treating HPK1-dependent disorders, methods for enhancing an immune response, and methods for preparing the naphthyridine compounds.