Synthesis of several 3,3-diarylazepan-4-ones and 5,5-diarylazepan-4-ones has been established starting from two tetrasubstituted olefins, which is derived from commercially available piperidine-3-carboxylic acid ethyl ester and piperidine-4-carboxylic acid ethyl ester. The single isomer with the structural skeleton of 3,3-diarylazepan-4-one and 5,5-diarylazepan-4-one is constructed in two functional group transformations of Grignard addition/dehydration and epoxidation/pinacol rearrangement. (c) 2006 Elsevier Ltd. All rights reserved.
CAN-mediated rearrangement of 4-benzhydrylidenepiperidines
摘要:
Several 1-substituted phenyl-(4-phenylpiperidin-4-yl)methanones are synthesized in modest overall yields starting from the reaction of different 1-substituted 4-benzhydrylidenepiperidines via CAN-mediated rearrangement. This facile strategy was also used to synthesize meperidine analog. (c) 2006 Elsevier Ltd. All rights reserved.