Rhodium(i)-catalyzed 1,4-conjugate arylation toward β-fluoroalkylated electron-deficient alkenes: a new entry to a construction of a tertiary carbon center possessing a fluoroalkyl group
作者:Zhang, Lili、Yu, Xiaoyu、Ouyang, Shenmao、Zhu, Chengjian、Li, Weipeng、Xie, Jin
DOI:10.1002/ejoc.202400392
日期:——
β-Trifluoromethylated ketones were synthesized from the corresponding α-trifluoromethylated styrenes and aromatic carboxylic acids by photoredox catalysis. This method involves phosphoranyl radical promoted deoxygenation of aromatic acids and hydroacylation of α−CF3 styrenes with the generated acyl radicals.
Rhodium(<scp>i</scp>)-catalyzed 1,4-conjugate arylation toward β-fluoroalkylated electron-deficient alkenes: a new entry to a construction of a tertiary carbon center possessing a fluoroalkyl group
Treatment of β-fluoroalkylated-α,β-unsaturated ketones with 1.2 equiv. of various arylboronic acids in the presence of 5 mol% of [Rh(COD)2]BF4 and 6 mol% of (S)-BINAP in toluene/H2O (v/v = 4/1) at the reflux temperature for 3 h gave the corresponding Michael adducts in high yields with over 90% enantioselectivity. Though other electron-deficient alkenes, such as vinylsulfone and vinylphosphonate, were found to be much less reactive in the rhodium-catalyzed conjugate addition with arylboronic acids, the reaction of various arylstannanes toward such electron-deficient alkenes took place very smoothly to afford the corresponding adducts in high yields.