Functionalization of α‐C(sp
<sup>3</sup>
)−H Bonds in Amides Using Radical Translocating Arylating Groups
作者:Niklas Radhoff、Armido Studer
DOI:10.1002/anie.202013275
日期:2021.2.15
α‐C−H arylation of N‐alkylamides using 2‐iodoarylsulfonyl radical translocating arylating (RTA) groups is reported. The method allows the construction of α‐quaternary carbon centers in amides. Various mono‐ and disubstituted RTA‐groups are applied to the arylation of primary, secondary, and tertiary α‐C(sp3)−H‐bonds. These radical transformations proceed in good to excellent yields and the cascades
A novel method was developed for the synthesis of tetrazoles from amides utilizing diphenyl phosphorazidate or bis(p-nitrophenyl) phosphorazidate as both the activator of amide–oxygen for elimination and azide source. Various amides were converted into the corresponding tetrazoles in good yields. This synthetic method allows to prepare 1,5-disubstituted and 5-substituted 1H-tetrazoles from various
Improved conditions for converting sterically hindered amides to 1,5-disubstituted tetrazoles
作者:Gretchen M. Schroeder、Sydney Marshall、Honghe Wan、Ashok V. Purandare
DOI:10.1016/j.tetlet.2010.01.024
日期:2010.3
Improved conditions for converting amides into 1,5-disubstituted tetrazoles are described. The optimum reaction conditions [diisopropyl azodicarboxylate (DIAD), diphenylphosphoryl azide (DPPA), and diphenyl-2-pyridyl phosphine in THF at 45 °C] converted stericallyhinderedamides to their corresponding tetrazoles in good yield.
as the oxidant source. This protocol tolerates with different functional groups on the substrates, and the catalytic efficiency is highly Lewis acidity-dependent on added LA, that is, a stronger LA provided a better promotional effect. The 1H NMR studies of the semireaction between the arylacetamide and the Pd(II)/Sc(III) catalyst in HOAc-d4 disclosed the formation of a palladacycle intermediate, and
本工作介绍了以分子氧为氧化剂源的 Pd(II)/LA 催化(LA:路易斯酸)芳基乙酰胺烯化。该协议对底物上的不同官能团具有耐受性,催化效率高度依赖于添加的 LA,即更强的 LA 提供了更好的促进效果。芳基乙酰胺与 Pd(II)/Sc(III) 催化剂在 HOAc- d 4中半反应的1 H NMR 研究揭示了钯环中间体的形成,并且C-H活化步骤是可逆的,这导致了氘代芳基乙酰胺底物和钯环中间体的形成。钯环中间体和烯烃之间的进一步半反应表明,它是一个干净且比 C-H 活化步骤快得多的反应,从而揭示了 Pd(II) 催化的 C-H 活化的多种机理信息。
2-METHYLPROP ANAMIDES AND THEIR USE AS PHARMACEUTICALS
申请人:Yao Wenqing
公开号:US20100137401A1
公开(公告)日:2010-06-03
The present invention relates to inhibitors of 11-β hydroxyl steroid dehydrogenase type 1, antagonists of the mineralocorticoid receptor (MR), and pharmaceutical compositions thereof. The compounds of the invention can be useful in the treatment of various diseases associated with expression or activity of 11-β hydroxyl steroid dehydrogenase type 1 and/or diseases associated with aldosterone excess.