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.
以
2,3,5,6-四甲基-N , N'-双(三
甲基甲
硅烷基)-
1,4-二氢吡嗪( 1a )为有机还原剂,
铬催化卤代芳醛
烯化,得到β-卤代
苯乙烯衍
生物以反式选择的方式。该反应不需要
锌和
锰等
金属粉末作为还原剂,从而最大限度地减少了
金属基反应废物。