A catalyst-free and additive-free method for the synthesis of benzothiazolethiones from <i>o</i>-iodoanilines, DMSO and potassium sulfide
作者:Xiaoming Zhu、Wenguang Li、Xiai Luo、Guobo Deng、Yun Liang、Jianbing Liu
DOI:10.1039/c8gc00477c
日期:——
Under catalyst-free and additive-free conditions, a novel, convenient, environment-friendly method for the synthesis of benzothiazolethiones from o-iodoanilines, K2S and DMSO has been developed.
Synthesis of indolo- and pyrrolo[1,2-<i>a</i>]quinoxalinones through a palladium-catalyzed oxidative carbonylation of the <i>C</i><sub>2</sub> position of indole
作者:Attoor Chandrasekhar、Sethuraman Sankararaman
DOI:10.1039/c9ob02703c
日期:——
Cu(OAc)2 as an oxidant in toluene at 80 °C forms the corresponding quinoxalinones as exclusive products in good yields. The catalytically active C-H activated intermediate Pd complex was isolated and characterized for the first time which on exposure to CO gas in toluene at 80 °C gave the corresponding quinoxalinone derivative. On the basis of isolation of the intermediate, a possible mechanism has been proposed
Synthesis of Highly Enantioenriched 3,4-Dihydroquinolin-2-ones by 6-<i>Exo-trig</i> Radical Cyclizations of Axially Chiral α-Halo-<i>ortho</i>-alkenyl Anilides
作者:David B. Guthrie、Steven J. Geib、Dennis P. Curran
DOI:10.1021/ja9066282
日期:2009.10.28
Radicalcyclizations (Bu(3)SnH, Et(3)B/air, rt) of racemic alpha-halo-ortho-alkenyl anilides provide 3,4-dihydroquinolin-2-ones in high yield. Cyclizations of enantioenriched precursors occur in similarly high yields and with transfer of axialchirality to the new stereocenter of the products with exceptionally high fidelity (often >95%). Single and tandem cyclizations of alpha-halo-ortho-alkenyl anilides