A simple microwave-assisted preparation of 2-bromo-1-alkenes from 1-alkynes using the LiBr–TMSCl–TEAB reagent system
摘要:
2-Bromo-1-alkenes are cleanly and conveniently generated in good yields and selectivities via microwave-assisted hydrobromination of 1-alkynes using a combination of lithium bromide (LiBr), chlorotrimethylsilane (TMSCl), and tetraethylammonium bromide (TEAB) in acetonitrile (MeCN). (C) 2011 Elsevier Ltd. All rights reserved.
Palladium-catalyzed cross-coupling of unactivated alkylzinc reagents with 2-bromo-3,3,3-trifluoropropene and its application in the synthesis of fluorinated amino acids
trifluoromethylated and difluoromethylated aminoacids that are of great interest in peptide/protein based chemical biology. The advantages of the synthesis of these fluorinated aminoacids are synthetic simplicity and diversity from a simple and readily available key intermediate α-trifluoromethylalkene-containing aminoacid, providing a facile route for applications in medicinal chemistry and life science
2-Bromo-1-alkenes are cleanly and conveniently generated in good yields and selectivities via microwave-assisted hydrobromination of 1-alkynes using a combination of lithium bromide (LiBr), chlorotrimethylsilane (TMSCl), and tetraethylammonium bromide (TEAB) in acetonitrile (MeCN). (C) 2011 Elsevier Ltd. All rights reserved.
Hypervalent iodine-mediated gem-difluorination of vinyl halides enabled by exclusive 1,2-halo migration
作者:Chenglong Li、Yangzhen Liao、Xuemei Tan、Xiaozu Liu、Peijun Liu、Wen-Xin Lv、Honggen Wang
DOI:10.1007/s11426-021-9965-9
日期:2021.6
β-Difluorinated alkyl halides are of significant value in the modular synthesis of gem-difluorinated molecules. An exclusive 1,2-halo migratory gem-difluorination of vinyl halides with in situ-generated PhIF2·HF is described. This protocol provides a general and practical approach towards a wide variety of β-difluorinated alkyl bromides. Both α- and β-bromoalkyl alkenes are suitable substrates, leading