Studies of π-diastereofacial selectivity: Spiro 2-tetrahydrofuran and 2-tetrahydrothiophene ketones
作者:Martin Dimitroff、Alex G Fallis
DOI:10.1016/s0040-4039(98)00407-9
日期:1998.4
The facial influence and synthetic utility of oxygen, sulfur and carbon atoms adjacent to the ketone in the series of alpha-spiro ketones 2, 3, and 4 upon nucleophilic addition has been examined. Addition to the carbonyl group displayed a preference for attack anti to the heteroatom in competition with carbon in synthetically useful ratios. Hydride reduction of 2 with chelating reagents (NaBH4, LiAlH4 etc.) reversed this facial preference. (C) 1998 Elsevier Science Ltd. All rights reserved.
Studies of π-diastereofacial selectivity: The influence of α-oxathiolane ketals on cyclic ketones
作者:Martin Dimitroff、Alex G Fallis
DOI:10.1016/s0040-4039(98)00406-7
日期:1998.4
influence and synthetic utility of oxygen and sulfur heteroatoms adjacent to carbocyclic ketones upon nucleophilic addition has been investigated. Addition to the carbonyl group displayed a preference for attack anti to sulfur and syn to oxygen in synthetically useful ratios. Diisopropylaluminum hydridereduction in the cyclopentanone series reversed this facial preference.