New carboxamide compounds having melanin concentrating hormone antagonistic activity, pharmaceutical preparations comprising these compounds and process for their manufacture
New carboxamide compounds having melanin concentrating hormone antagonistic activity, pharmaceutical preparations comprising these compounds and process for their manufacture
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‐Selective C−H Arylation of Electron‐Deficient Thiophenes, Pyrroles, and Furans
作者:Luo‐Yan Liu、Jennifer X. Qiao、William R. Ewing、Kap‐Sun Yeung、Jin‐Quan Yu
DOI:10.1002/ijch.201900134
日期:2020.3
A general β‐C−Harylation of electron‐deficient thiophenes, pyrroles, and furans has been developed using ligand‐modulated palladium catalyst. The use of a modified norbornene is crucial for reversing the conventional α‐selectivity of these substrates. This method features good yields, high β‐selectivity, and good tolerance of functional groups.
The application of vinamidinium salts to the synthesis of 2,4-disubstituted thiophenes
作者:Ryan T. Clemens、Stanton Q. Smith
DOI:10.1016/j.tetlet.2004.12.113
日期:2005.2
The synthesis of 2,4-disubstituted thiophenes by the condensation of symmetrical vinamidiniumsalts with methyl thioglycolate has been accomplished for the first time. Simple experimental conditions were used to prepare seven different methyl 4-aryl-2-thiophenecarboxylates, three of which are new compounds.