Generation of 3-piperidine(methan)amines and cyclic 3-piperidine-methanamines as potential substance P antagonists
摘要:
A general method is described for the synthesis of 3-piperidine(methan)amines and their cyclic analogues. The 3,5-dichloro-2H-1,4-oxazin-2-ones 6 and 3-aryl substituted analogues are reacted with acetylenic dienophiles yielding pyridines. Further catalytic hydrogenation and functional group transformation (1) or substitution (2-3) with ring closure reactions (4) followed by hydrogenation provided the 2,3,5-cis substituted piperidines 1-3 and a cis substituted [3,4-c]pyrrolopiperidine 4. These compounds have recently raised great interest due to their Substance P antagonist profiles. (C) 1997 Elsevier Science Ltd.
Functionalized o-bis(chloromethyl)pyridines as precursors for pyridine o-quinodimethane analogues and their [4+2] cycloadducts
作者:Peter R. Carly、Frans Compernolle、Georges J. Hoornaert
DOI:10.1016/0040-4039(95)00169-d
日期:1995.3
From oxazinones 4, precursors for pyridine o-quinodimethaneanalogues are made accessible via cycloaddition with 1,4-dichloro-2-butyne and propargyl chloride. Subsequent 1,4-elimination of the polyfunctional o-bis(chloromethyl)-pyridines affords both 2,3- and 3,4-dimethylene compounds, which are trapped in situ with various dienophiles.