Iminophosphorane-mediated annelation of a pyridine ring into a preformed pyridine one: synthesis of naphthyridine, pyrido[1,2-c]pyrimidine and pyrido[1,2-c]quinazoline derivatives
作者:Pedro Molina、Angeles Lorenzo、Enrique Aller
DOI:10.1016/s0040-4020(01)81234-5
日期:1992.1
from 4- and 3-formylpyridines by sequential treatment with ethyl azido acetate and triphenylphosphine, with isocyanides leads to 2,7-naphthyridine, 4, 1,7-naphthyridine 7 and 2,6-naphthyridine 8 respectively. Iminophosphoranes 10 and 22 undergo pyrido annelation by reaction with isocyanates, carbon dioxide, carbon disulfide and acyl chlorides to give pyrido[1,2-c]pyrimidine 11–14 and pyrido[1,2-c]quinazoline
亚氨基正膦的维蒂希氮杂型反应2和6,通过与叠氮基乙基醋酸和三苯基膦,用异氰化物导致2,7-萘啶,顺序处理由4-和3- formylpyridines制备4,1,7-二氮杂萘7和图2, 6-萘啶分别为8。氨基膦10和22通过与异氰酸酯,二氧化碳,二硫化碳和酰氯反应而发生吡啶基化反应,从而得到吡啶并[1,2-c]嘧啶11-14和吡啶并[1,2-c]喹唑啉衍生物23-26。