[4 + 3] Cycloadditions with Bromo-Substituted Morita–Baylis–Hillman Adducts of Isatins and<i>N</i>-(<i>ortho</i>-Chloromethyl)aryl Amides
作者:Gu Zhan、Ming-Lin Shi、Qing He、Wei Du、Ying-Chun Chen
DOI:10.1021/acs.orglett.5b02279
日期:2015.10.2
Efficient construction of a challenging aza-spirocycloheptane oxindole scaffold is reported through an unprecedented [4 + 3] cycloaddition reaction with bromo-substituted Morita–Baylis–Hillman adducts of isatins and N-(ortho-chloromethyl)aryl amides. Both reactive intermediates, the allylic phosphonium ylides and aza-o-quinone methides, were in situ generated, chemoselectively facilitated by a Lewis
通过空前的[4 + 3]环取代反应,与靛红和N-(邻-氯甲基)芳基酰胺的溴取代的Morita-Baylis-Hillman加合物进行了空前的[4 + 3]环加成反应,报道了一种具有挑战性的aza-spirocycloheptane oxindole支架的有效构建。两种反应性中间体,即烯丙基磷鎓叶立德和氮杂-邻醌甲基化物,均是在原位生成的,分别通过路易斯碱和布朗斯台德碱进行了化学选择性的促进。