Thiol-free chemoenzymatic synthesis of β-ketosulfides
作者:Adrián A Heredia、Martín G López-Vidal、Marcela Kurina-Sanz、Fabricio R Bisogno、Alicia B Peñéñory
DOI:10.3762/bjoc.15.34
日期:——
A preparation of β-ketosulfides avoiding the use of thiols is described. The combination of a multicomponent reaction and a lipase-catalysed hydrolysis has been developed in order to obtain high chemical diversity employing a single sulfur donor. This methodology for the selective synthesis of a set of β-ketosulfides is performed under mild conditions and can be set up in one-pot two-step and on a
Rhodium(<scp>ii</scp>)-mediated reactions of thiobenzoylketene S,N-acetals with α-diazo carbonyl compounds: synthesis of 2-substituted 3-alkylamino-5-phenylthiophenes
作者:Hyun Min Song、Kyongtae Kim
DOI:10.1039/b203931a
日期:——
Treatment of 3-methylamino-3-methylsulfanyl-1-phenylpropenethione 1 with excess (2.5 equiv.)
α-diazo carbonyl compounds such as α-diazoketones and α-diazoesters in the presence of a catalytic amount of Rh(II) acetate in CH2Cl2 at rt gave 2-acyl- or 2-aroyl-3-methylamino-5-phenylthiophenes and alkyl 3-methylamino-5-phenylthiophene-2-carboxylates, respectively, as major products along with 1-phenyl-2-methylsulfanylethanones. The formation of the major products indicates that the carbenes or carbenoids generated interact initially with the thione sulfur of 1.
Substituted α-Sulfur Methyl Carbanions: Effective Homologating Agents for the Chemoselective Preparation of β-Oxo Thioethers from Weinreb Amides
作者:Raffaele Senatore、Laura Ielo、Ernst Urban、Wolfgang Holzer、Vittorio Pace
DOI:10.1002/ejoc.201800095
日期:2018.6.7
generation of α‐thiomethyllithium reagents via reductive lithiation or deprotonation followed by reaction with variously functionalized Weinreb amides represents an excellent method to access β‐oxo thioethers. The procedure is adaptable to alkyl‐ or aryl‐ thiomethyllithium conjugates. It has the advantages of conceptual simplicity and versatility of the addition of organometallics to Weinreb amides with the
�ber Alkyl-(?-oxy-?-aryl-�thyl)-sulfide und Dialkyl-(?-oxy-?-aryl-�thyl)-sulfonium-salze
作者:V. Prelog、V. Hahn、H. Brauchli、H. C. Beyerman
DOI:10.1002/hlca.194402701157
日期:——
Rh/DuanPhos-Catalyzed Asymmetric Hydrogenation of β-Acetylamino Vinylsulfides: An Approach to Chiral β-Acetylamino Sulfides
作者:Wenchao Gao、Hui Lv、Xumu Zhang
DOI:10.1021/acs.orglett.7b01115
日期:2017.6.2
Rh/DuanPhos-catalyzed asymmetric hydrogenation of challenging beta-acetylamino vinylsulfides has been developed; affording chiral beta-acetylamino, sulfides with high yield's and excellent ee's (up to, 99% ee). This novel methodology provides an efficient and' concise, synthetic route, to chiral beta-acetylamino sulfides. The potential utility of this protocol in the synthesis of Apremilast has also been disclosed.