作者:Raj K. Bansal、Garima Pandey、Rakhi Gupta、Konstantin Karaghiosoff、Alfred Schmidpeter
DOI:10.1055/s-1995-3865
日期:1995.2
Cyclocondensation of 2-alkyl-1-aminopyridinium iodides 1a-c with phosphorus trichloride in the presence of triethylamine gives 1,2,3-diazaphospholo[1,5-a]pyridines 2a-c. 1-Unsubstituted products 2a,b undergo dichlorophosphinylation at the 1-position. Hydrolysis causes rupture of the N=P bond in 2c leading to opening of the five-membered ring. Dimethyl sulphate methylates 2c at N-3.
在存在三乙胺的情况下,2-烷基-1-氨基吡啶鎓碘化物1a-c与三氯化磷的环缩合反应生成1,2,3-二氮杂磷杂环戊并[1,5-a]吡啶2a-c。1-未取代产物2a,b在1位发生二氯膦化反应。水解导致2c中的N=P键断裂,从而打开五元环。硫酸二甲酯在N-3位甲基化2c。