Silver Mediated Banert Cascade with Carbon Nucleophiles
作者:Juliana R. Alexander、Paul V. Kevorkian、Joseph J. Topczewski
DOI:10.1021/acs.orglett.1c01032
日期:2021.4.16
Palladium-catalyzed one-pot synthesis of polysubstituted furans from alkynoates and 2-yn-1-ols
作者:Huawen Huang、Huanfeng Jiang、Hua Cao、Jinwu Zhao、Dabin Shi
DOI:10.1016/j.tet.2011.12.033
日期:2012.4
Easily accessible propargyl vinyl ethers are found to be acyclic precursors to construct furan derivatives. According to the reactive behavior of the substrates and the regulation of reaction conditions, three synthetic routes to polysubstituted furans via palladium-catalyzed reactions of propargyl vinyl ethers in situ-prepared from alkynoates and 2-yn-1-ols are presented herein. These methods could have potential application in synthetic and pharmaceutical chemistry for its facilitation and accessible starting materials. (C) 2011 Elsevier Ltd. All rights reserved.
Intercepting the Banert cascade with nucleophilic fluorine: direct access to α-fluorinated <i>N</i>H-1,2,3-triazoles
作者:J. R. Alexander、P. V. Kevorkian、J. J. Topczewski
DOI:10.1039/d1cc01179k
日期:——
The treatment of propargylic azides with silver(I) fluoride in acetonitrile was found to yield α-fluorinated NH-1,2,3-triazoles via the Banert cascade. The reaction was regioselective and the products result from an initial [3,3] rearrangement. The reaction is demonstrated on >15 examples with yields ranging from 37% to 86%.
Catalytic Ynone–Amidine Formal [4 + 2]-Cycloaddition for the Regioselective Synthesis of Tricyclic Azepines
作者:T. Prabhakar Reddy、Jagjeet Gujral、Pritam Roy、Dhevalapally B. Ramachary
DOI:10.1021/acs.orglett.0c03711
日期:2020.12.18
A Ca(OTf)2- and self-promoted ynone–amidine atom-economic formal [4 + 2]-cycloaddition of various ynones with amidines is reported for the construction of highly functionalized tricyclic azepines. High reaction rate, ease of operation, and high product selectivity with wide substrate scope are the key advantages of the present annulation protocol.