α-Aroylidineketene dithioacetal chemistry: CuI catalyzed synthesis of 2-styryl benzimidazoles enroute to regioselective hydrothiolation
摘要:
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.
Brønsted Acid Catalyzed PhSe Transfer versus Radical Aryl Transfer: Linear Codimerization of Styrenes and Internal Olefins
作者:Ping Wu、Liandi Wang、Kaikai Wu、Zhengkun Yu
DOI:10.1021/ol503731s
日期:2015.2.20
intermediates. Radical reduction of the resultant PhSe-alkyl-substituted ketene dithioacetals with AIBN/n-Bu3SnH gave the corresponding anti-Markovnikov hydrovinylation products formally from the linearcodimerization of styrenes and the internal olefins.
Synthesis of chiral α-carbonyl-δ-nitro-ketenedithioacetals via l-proline-catalyzed Michael addition reaction
作者:Mathiyazhagan Arun Divakar、Sivakumar Shanmugam
DOI:10.1007/s11164-017-3025-1
日期:2017.12
Abstract Regioselective synthesis of 1,1-bis(methylthio)-6-nitro-5-arylhex-1-en-3-one has been achieved from α-alkenoylketene dithioacetals with nitromethane using l-proline catalyst viaMichaeladdition. The synthesized compounds 3a–j were well characterised by NMR and mass spectral techniques. One of the structures was confirmed by single crystal XRD. The enantioselectivity and its specific rotation