Electrophilic ipso-Iodocyclization of N-(4-Methylphenyl)propiolamides: Selective Synthesis of 8-Methyleneazaspiro[4,5]trienes
摘要:
[GRAPHICS]A novel and selective method for the synthesis of 8-methylenespiro[4,5]trienes via intramolecular electrophilic ipsoiodocyclization of N-(4-methylphenyl)propiolamides has been developed. In the presence of ICI or I-2, 8-methylene-1-azaspiro[4,5]trienes were selectively prepared from the electrophilic ipso-iodocyclization of N-(4-methylphenyl)propiolamides in moderate to good yields.
Stereoselective Construction of 3-(Aminoalkylidene)oxindoles in One Pot: Development of a Novel, Robust, and Scalable Process for the Multigram-Scale Preparation of Nintedanib
作者:Saroj Maji、Sabyasachi Halder、Ashok Kumar Sharma、Avinash Madhesiya、Tejender S. Thakur、Gautam Panda
DOI:10.1021/acs.oprd.3c00469
日期:2024.3.15
oxindole intermediate 17 via our advanced Heck/Buchwald–Hartwig reaction cascade, which enables the reduction of the number of synthetic steps. Moreover, our approach avoids the expensive column chromatography purification method for all synthetic steps. Further, we also disclosed an alternative route toward the synthesis of another kinase inhibitor hesperadin (2) following the above-mentioned cascade method
Synthesis of Benzofused <i>O</i>- and <i>N</i>-Heterocycles through Cascade Carbopalladation/Cross-Alkylation of Alkynes Involving the C–C Cleavage of Cyclobutanols
intramolecular carbopalladation of tethered alkynes with an alkylation step produced by the C–C cleavage of cyclobutanol derivatives. An alkenyl-Pd(II) intermediate has been isolated and characterized by X-ray diffraction studies. Interestingly, the nature of the tethering alkynyl chain influences the E/Z stereochemistry of the alkenyl fragment in the functionalized heterocycles.
我们报告了 Pd 催化的带有四取代烯烃片段的杂环的路线。我们的方法将束缚炔烃的分子内碳钯化与环丁醇衍生物的 C-C 裂解产生的烷基化步骤相结合。已分离出一种烯基-Pd(II) 中间体,并通过 X 射线衍射研究对其进行了表征。有趣的是,束缚炔基链的性质会影响官能化杂环中烯基片段的E / Z立体化学。
Electrophilic <i>ipso</i>-Iodocyclization of <i>N</i>-(4-Methylphenyl)propiolamides: Selective Synthesis of 8-Methyleneazaspiro[4,5]trienes
作者:Quan-Fu Yu、Yue-Hua Zhang、Qin Yin、Bo-Xiao Tang、Ri-Yuan Tang、Ping Zhong、Jin-Heng Li
DOI:10.1021/jo800328a
日期:2008.5.1
[GRAPHICS]A novel and selective method for the synthesis of 8-methylenespiro[4,5]trienes via intramolecular electrophilic ipsoiodocyclization of N-(4-methylphenyl)propiolamides has been developed. In the presence of ICI or I-2, 8-methylene-1-azaspiro[4,5]trienes were selectively prepared from the electrophilic ipso-iodocyclization of N-(4-methylphenyl)propiolamides in moderate to good yields.