PC–N-Heterocycles: synthesis of biaryl-type 1,3-benzazaphospholes with ortho-substituted phenyl or 2-heteroaryl groups
作者:Bhaskar Reddy Aluri、Basit Niaz、Markus K. Kindermann、Peter G. Jones、Joachim Heinicke
DOI:10.1039/c0dt00881h
日期:——
o-bromoderivative 2d proceeds with concomitant replacement of bromine by hydrogen, whereas the electron-withdrawing pyridyl group of 2h prevents the synthesis of 3h by this short route. An alternative synthesis of 2-pyridylbenzazaphosphole 3hvia anilidophosphonates succeeded starting from Fmoc-anilinophosphonate 2kvia selective cleavage of the N-protecting group, reduction of the resulting phosphonoaniline to phosphinoaniline
官能取代的2-(杂)的简便合成芳基-1,3- benzazaphospholes经由N-酰基-2- bromoanilides的镍基或钯催化的膦酰化1A-K与亚磷酸三乙酯被表达。与萘甲酰基,邻位取代的苯基,糠酰基或壬酰基的苯胺膦酸酯2a–g可以使用LiAlH 4直接还原成苯并氮杂3。邻溴代衍生物2d的反应伴随着溴被氢取代,而2h的吸电子吡啶基阻止了这种短路径的3h合成。的替代合成2-吡啶基苯并氮杂磷 从Fmoc-苯胺基膦酸酯2k开始,通过选择性地裂解N保护基,将生成的膦酰苯胺还原为苯胺膦酸酯3h ,从苯胺膦酸酯2k开始成功膦酰苯胺并通过二氢苯并氮杂膦8与吡啶-2-羧醛环合。检测到N-取代的吡啶基甲基苯并氮杂磷9为副产物。新化合物的结构阐明基于多核NMR数据和磷酰苯胺的X射线晶体结构分析,突显了3h和2h时N–H –OP P氢键比N–H⋯O C型氢键的优势。3b的超分子缔合物及其空前的空气氧化产物10。