Photoinduced Cyclizations of <i>o</i>-Diisocyanoarenes with Organic Diselenides and Thiols that Afford Chalcogenated Quinoxalines
作者:Cong Chi Tran、Shin-ichi Kawaguchi、Fumiya Sato、Akihiro Nomoto、Akiya Ogawa
DOI:10.1021/acs.joc.0c00647
日期:2020.6.5
via the photoinduced cyclizations of o-diisocyanoarenes with diaryl or dialkyl diselenides, in addition to providing a detailed discussion of the corresponding mechanism and revealing that the developed procedure can also be applied to prepare 2-thiolated quinoxaline derivatives from o-diisocyanoarenes and thiols. The developed technique does not need the use of additives or metal catalysts and features
A general method for the preparation of o-diisocyanoarenes in moderate to good yields has been developed by the dehydration of o-di(formamido) arenes with trichloromethyl chloroformate at - 78°C to 0°C.
Metal-Free Synthesis of <i>N</i>-(Carboselenoate) Benzimidazolones by Cascade Cyclization of <i>ortho</i>-Diisocyanoarenes and Selenosulfonates
作者:Yi Fang、Can Liu、Weidong Rao、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.orglett.9b01886
日期:2019.10.4
A facile synthesis of N-(carboselenoate) benzimidazolones through metal-free reactions of ortho-diisocyanoarenes with selenosulfonates is reported here. The desired products are obtained in moderate to good yields with good functional group compatibility. The ortho-diisocyanoarenes are applied to the construction of 2-benzimidazolone derivatives for the first time.
A visible-light-induced radical cascade cyclization of ortho-diisocyanoarenes for the synthesis of diethyl benzo[a]phenazine-6,6(5H)-dicarboxylates has been developed. This process provides an efficient and convenient protocol for the construction of benzo[a]phenazine skeleton that widely present in biologically active molecules and pharmaceuticals. The reaction takes place under mild conditions and
已开发出用于合成苯并[ a ]吩嗪-6,6(5 H )-二羧酸二乙酯的邻二异氰芳烃的可见光诱导自由基级联环化。该过程为构建广泛存在于生物活性分子和药物中的苯并[ a ]吩嗪骨架提供了一种高效便捷的方案。该反应在温和的条件下进行,以中等至极好的收率获得产物。