The 2-acylcycloalkanones 1a-g and 3a-c, possessing a polyfluoroalkyl group. react with hydroxylamine regio- and stereoselectively to yield 4,5-dihydroisoxazol-5-ols 2a-g and 4a-c, respectively i.e., products of N-addition to the oxo group at the cycloalkane ring (Schemes 1 and 2). The products 2 and 4 can be dehydrated under drastic conditions only (Schemes 3 and 4). The structure of one of the 4,5-dihydroisoxazol-5-ols was confirmed by X-ray crystal-structure analysis.
inhibitors the reaction of 5-amino-1-tert-butyl-1H-pyrrolo-3-carbonitrile with fluorinated 1,3-biselectrophiles was studied. An efficient and convenient synthetical approach to obtain fluorinated pyrrolo[2,3-b]pyridines was developed. tert-Butyl protecting group was successfully cleaved by treating of synthesized pyrrolopyridines with concentrated sulfuric acid.