Syntheses of piperidine and perhydroazepine derivatives, precursors of two selective antagonists of muscarinic M2 receptors: AF-DX 384 and its perhydroazepine isomer
作者:C�cile Perrio-Huard、Christophe Ducandas、Marie Claire Lasne、Bernard Moreau
DOI:10.1039/p19960002925
日期:——
7. Transformations of piperidinemethanol 11 afford exclusively compound 2a (5 steps, 17–20% overall yield)via the N-tosylpiperidine 12, ut lead o a 1:1 mixture of isomers 2a and 2b (4 steps, 15–20% overall yield for compounds 2a and 2b)via the N-(cyanomethyl)piperidine 15. Limitations to the ring enlargement of piperidine derivatives as a function of the heterocyclic nitrogen substituent are defined
已开发并比较了制备毒蕈碱拮抗剂AF-DX 384 1a及其全氢氮杂烷异构体1b所需的几种合成多胺2a和2b的途径。从4-(氯甲基)-吡啶3中分4步获得哌啶2a,总产率为13-15%。从3-氨基内酰胺7中以49%的总产率分四个步骤制备过氢hydro庚因2b。专门化合物2a(5个步骤,17-20%总产率)经由所述ñ -tosylpiperidine 12,UT引线OA 1:异构体2a和2b的1:1混合物(4个步骤,对化合物2a和2b 15-20%总产率)通过在ñ-(氰基甲基)哌啶15.定义了哌啶衍生物根据杂环氮取代基的扩环的限制。