Synthesis of chromeno[4,3,2-cd]isoindolin-2-ones and chromeno[4,3,2-de]isoquinolin-3-ones. Electrophilic versus anionic cyclization of carbamates
作者:M. Carmen de la Fuente、Domingo Domínguez
DOI:10.1016/j.tet.2004.07.089
日期:2004.10
The total synthesis of chromeno[4,3,2-cd]isoindolin-2-ones 6a–d and chromeno[4,3,2-de]isoquinolin-3-ones 15a–b from 4-methoxy-9H-xanthen-9-one is reported. The construction of the nitrogenated ring was attempted by both intramolecular electrophilic and anionic cyclizations of the corresponding carbamate precursors. Only anionic cyclization was possible for isoindolinones, but for isoquinolinones the
由4-甲氧基-9 H-黄嘌呤的全合成chromeno [4,3,2- cd ]异吲哚啉-2-酮6a – d和chromeno [4,3,2- de ]异喹啉-3-酮15a – b由4-甲氧基-9 H-黄嘌呤合成-9-一。通过相应的氨基甲酸酯前体的分子内亲电和阴离子环化,试图构建氮化环。对于异吲哚啉酮,仅阴离子环化是可能的,但是对于异喹啉酮,亲电和阴离子途径均提供优异的产率。