CuCl2 and CuBr2-mediated intramolecular oxidative C–H/N–H cross-coupling/halogenation of β-thioalkyl-α-alkenoyl ketene N,S-acetals provides a new concise synthetic route to pyrrolones.
Domino carbocationic rearrangements of α-[bis(methylthio)methylene]alkyl-2-(heteroaryl)cyclopropyl ketones
作者:S Peruncheralathan、V Sriram、H Ila、H Junjappa
DOI:10.1016/j.tet.2004.04.048
日期:2004.6
Domino carbocationic rearrangements of α-[bis(methylthio)methylene]alkyl-2-(heteroaryl)cyclopropylketones (X=O, S, NMe) bearing five-membered heteroaryl group have been investigated. Although the cyclopropylketones (R1=H) gave similar products like their aryl counterparts under these conditions, the corresponding α-methylcyclopropyl ketones (R1=Me) yielded a variety of unexpected products depending
α-Aroylidineketene dithioacetal chemistry: CuI catalyzed synthesis of 2-styryl benzimidazoles enroute to regioselective hydrothiolation
作者:Pandi Dhanalakshmi、Sivakumar Shanmugam
DOI:10.1016/j.tet.2015.06.008
日期:2015.9
Reactivity of alpha-aroylidineketene dithioacetals 2 was investigated to synthesize novel 2-styrylbenzimidazole derivatives 4 and their hydrothiolated product 2-(2-(methylthio)-2-arylethyl)-1H-benzoidlimidazoles 5 has been reported. Compounds 4 and 5 were synthesized by cyclocondensation of alpha-aroylidineketene dithioacetals 2 and o-phenylene diamine (OPD) 3 in the presence and absence of copper catalyst respectively. Regioselective one-pot tandem hydrothiolation of olefin functionality in 4 was achieved under AcOH conditions. (C) 2015 Elsevier Ltd. All rights reserved.