A novel method for bromodecarboxylation of α,β-unsaturated carboxylic acids using catalytic sodium nitrite
作者:Vikas N. Telvekar、Balaram S. Takale
DOI:10.1016/j.tetlet.2011.02.101
日期:2011.5
A first novel synthetic utility of catalytic sodiumnitrite in combination with aqueous HBr, for bromo decarboxylation of α,β-unsaturated carboxylicacid is described. α,β-Unsaturated carboxylicacid compounds successfully converted into corresponding bromo compounds. The advantages of this protocol are shorter reaction time and moderate to good yields.
Chromium-catalyzed olefination of arylaldehydes with haloforms assisted by 2,3,5,6-tetramethyl-<i>N</i>,<i>N</i>′-bis(trimethylsilyl)-1,4-dihydropyrazine
作者:Kohei Nishi、Hayato Tsurugi、Kazushi Mashima
DOI:10.1039/d2cc06104j
日期:——
Chromium-catalyzed olefination of arylaldehydes with haloforms was achieved using 2,3,5,6-tetramethyl-N,N′-bis(trimethylsilyl)-1,4-dihydropyrazine (1a) as an organic reducing agent, giving β-halostyrene derivatives in a trans-selective manner. The reaction required no metal powders, such as zinc and manganese, as reductants, thereby minimizing metal-based reaction waste.