A versatile route to 2-alkyl-/aryl-amino-3-formyl- and hetero-annelated-chromones, through a facile nucleophilic substitution at C2 in 2-(N-methylanilino)-3-formylchromones
作者:Gurmit Singh、Rajinder Singh、Navdeep K Girdhar、M.P.S Ishar
DOI:10.1016/s0040-4020(02)00128-x
日期:2002.3
N-methylanilino group in 2-(N-methylanilino)-3-formylchromones, obtained in high yield by rearrangement of C(4-oxo-4H[1]-benzopyran-3-yl)-N-phenylnitrones to 2-anilino-3-formyl-chromones followed by N-methylation, undergoes facile nucleophilic substitution by a variety of nitrogen nucleophiles, thereby paving the way for synthesis of a variety of novel 2-substituted-3-formylchromone derivatives as well as hetero-annelated
所述Ñ -methylanilino在2-(组Ñ被C的重排以高收率获得-methylanilino)-3- formylchromones,(4-氧代-4- ħ [1]苯并吡喃-3-基) - Ñ -phenylnitrones到2-苯胺-3-甲酰基色酮,然后进行N-甲基化,被各种氮亲核试剂进行亲核取代,从而为合成各种新型2-取代-3-甲酰基色酮衍生物和杂化退火色酮铺平了道路。 。