Palladium(0) catalyzed coupling oftrans-1,2-Bis(tri-n-butylstannyl)ethylene with aromatic halides: a convenient Synthesis of substitutedtrans-β-bromostyrenes
作者:Richard A. Haack、Thomas D. Penning、Stevan W. Djurić、John A. Dziuba
DOI:10.1016/0040-4039(88)85208-0
日期:1988.1
trans-β-Bromostyrenes have been conveniently prepared in moderate to high yield in a one-pot two-step sequence.trans-1,2-Bis(tri-n-butylstannyl)ethylene underwent a smooth palladium(0) catalyzed coupling reaction with 0.5 equivalents of aromatic bromide or iodide to furnish atrans-β-stannylstyrene. This intermediate vinyl stannane, without isolation, was then converted to the substitutedtrans-bromostyrene on
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.