A Selective Synthesis of 2,2-Difluorobicyclo[1.1.1]pentane Analogues: “BCP-F<sub>2</sub>”
作者:Xiaoshen Ma、David L. Sloman、Yongxin Han、David J. Bennett
DOI:10.1021/acs.orglett.9b02026
日期:2019.9.20
The bicyclo[1.1.1]pentane (BCP) motif has been utilized as bioisosteres in drug candidates to replace phenyl, tert-butyl, and alkynyl fragments in order to improve physicochemical properties. However, bceause of the difficulty of synthesis, most BCP analogues prepared only bear 1,3-“para”-substituents. We report the first selective synthesis of 2,2-difluorobicyclo[1.1.1]pentanes via difluorocarbene
Selective [2σ + 2σ] Cycloaddition Enabled by Boronyl Radical Catalysis: Synthesis of Highly Substituted Bicyclo[3.1.1]heptanes
作者:Tao Yu、Jinbo Yang、Zhijun Wang、Zhengwei Ding、Ming Xu、Jingru Wen、Liang Xu、Pengfei Li
DOI:10.1021/jacs.2c13740
日期:——
2σ] radical cycloaddition between bicyclo[1.1.0]butanes (BCBs) and cyclopropyl ketones has been developed to provide a modular, concise, and atom-economical synthetic route to substituted bicyclo[3.1.1]heptane (BCH) derivatives that are 3D bioisosteres of benzenes and core skeleton of a number of terpene natural products. The reaction was catalyzed by a combination of simple tetraalkoxydiboron(4) compound
Lewis acid-catalyzed diastereoselective carbofunctionalization of bicyclobutanes employing naphthols
作者:Avishek Guin、Subrata Bhattacharjee、Mahesh Singh Harariya、Akkattu T. Biju
DOI:10.1039/d3sc01373a
日期:——
0]butanes (BCBs) for cyclobutane synthesis suffers from poor diastereoselectivity. Although few reports on BCB ring-opening via polar mechanisms are available, the Lewis acid-catalyzed diastereoselective ring-opening of BCBs using carbon nucleophiles is still underdeveloped. Herein, we report a mild and diastereoselectiveBi(OTf)3-catalyzed ring-opening of BCBs employing 2-naphthols. The anticipated
Enantioselective Synthesis of Chiral Cyclobutenes Enabled by Brønsted Acid-Catalyzed Isomerization of BCBs
作者:Si-Li Lin、Ye-Hui Chen、Huan-Huan Liu、Shao-Hua Xiang、Bin Tan
DOI:10.1021/jacs.3c06525
日期:2023.10.4
cyclobutenes with good regio- and enantiocontrol. The utilization of N-triflyl phosphoramide as a chiralBrønstedacid promoter enables this isomerization process to proceed under mild conditions with low catalyst loading as well as good functional group compatibility. The resulting chiral cyclobutenes could serve as platform molecules for downstream manipulations with excellent reservation of stereochemical
β-selectivity, have evolved as a powerful platform for synthesis of cyclobutanes, their application in the synthesis of cyclobutenes remains underdeveloped. Here, a novel visible light induced α-selective radical ring-opening reaction of 1,3-disubstituted acyl bicyclobutanes with alkyl radical precursors for the synthesis of functionalized cyclobutenes is described. In particular, primary, secondary, and