P<sup>III</sup>-Mediated intramolecular cyclopropanation and metal-free synthesis of cyclopropane-fused heterocycles
作者:Jiayong Zhang、Jiahang Hao、Zhiqiang Huang、Jie Han、Zhengjie He
DOI:10.1039/d0cc04086j
日期:——
A P(NMe2)3-mediated reductive intramolecular cyclopropanation is developed for the first time, which provides facileaccess to a wide variety of cyclopropane-fused heterocycles including chromanes, tetrahydroquinolines, lactones, and lactams. Catalytic hydrogenative ring-expansion of the cyclopropane-fused heterocycles is also elaborated, leading to various structurally important medium-sized heterocycles
The antibiotic agent fumimycin has been synthesized for the first time. This natural product was found to inhibit the bacterial peptide deformylase and may represent a lead structure to a class of novel antibacterials. Our synthetic strategy towards fumimycin involved the following steps: Dakin oxidation of an aldehyde functionality, conversion of an oxime through radical fragmentation to form an
Lewis Base-Catalyzed Intramolecular Vinylogous Aldol Reaction and Chemoselective Syntheses of 3-Hydroxy-2,3-Disubstituted Dihydrobenzofurans and Indolines
作者:Jiayong Zhang、Zhengjie He
DOI:10.1021/acs.joc.3c01313
日期:2023.9.15
A Lewis base-catalyzed intramolecular vinylogous aldol reaction of o-(allyloxy)phenyl ketoesters or o-(allylamino)phenyl ketoesters has been developed. This reaction provides ready access to 3-hydroxy-2,3-disubstituted dihydrobenzofurans and indolines in high yields with excellent chemoselectivity and diastereoselectivity. An acid-promoted dehydration of such products further extends the utility of