Synthesis of α-alkyl-α-aminosilanes by rhodium-catalyzed hydrosilylation of Boc-protected vinyl amines
摘要:
alpha -Aminosilanes can be readily prepared by rhodium-catalyzed hydrosilylation of Boc-substituted enamines, followed by acidic removal of the Boc group. This convergent approach allows for the rapid synthesis of new aminosilane structures, useful for their bioactivity and unique reactivity. (C) 2000 Elsevier Science Ltd. All rights reserved.
Decarboxylative Elimination of <i>N</i>-Acyl Amino Acids via Photoredox/Cobalt Dual Catalysis
作者:Kaitie C. Cartwright、Jon A. Tunge
DOI:10.1021/acscatal.8b03282
日期:2018.12.7
A dual-catalytic strategy for the synthesis of enamides and enecarbamates directly from easily accessible and inexpensive amino acids has been realized. This mild and efficient protocol makes use of an organic photoredox catalyst and a cobaloxime catalyst to achieve decarboxylative elimination using hydrogen evolution to drive the oxidation. Thus, the reaction occurs without a stoichiometric oxidant
Photoinduced Kochi Decarboxylative Elimination for the Synthesis of Enamides and Enecarbamates from <i>N</i>-Acyl Amino Acids
作者:Kaitie C. Cartwright、Simon B. Lang、Jon A. Tunge
DOI:10.1021/acs.joc.9b00167
日期:2019.3.1
accessible N-acylaminoacids to provide enamide and enecarbamate building blocks has been realized through the combination of an organophotoredox catalyst and copper acetate as the terminal oxidant. This operationally simple process utilizes inexpensive and readily available reagents without preactivation of the carboxylic acid. Enamides and enecarbamates are now accessible directly from N-acylamino acids
Organocatalysts Fold To Generate an Active Site Pocket for the Mannich Reaction
作者:Antti J. Neuvonen、Tamás Földes、Ádám Madarász、Imre Pápai、Petri M. Pihko
DOI:10.1021/acscatal.7b00336
日期:2017.5.5
imine which deactivates the catalyst, and imine to enamine isomerization reactions. In foldamer catalysts, the nucleophilicity of sulfur is reduced, which prevents catalyst deactivation. The results indicate that the improved catalytic performance of foldamer catalysts in Mannich reactions may not be due to cooperative effects of intramolecular hydrogen bonds but simply due to the presence of the folded
enantio‐ and diastereoselective synthesis of 6‐amino‐ trisubstituted tetrahydropyridine compounds has been developed through the inverse‐electron‐demand aza‐Diels–Alder reaction of N‐aryl α,β‐unsaturated ketimines with enecarbamates (E)‐1. Chiralphosphoricacid catalysts achieve simultaneous activation of both the 1‐azadiene and dienophile partners.
Compound of the formula
wherein R, and R2 are each independently -H or lower alkoxy; R3 and R4 are each independently lower alkyl; and Rs and R6 are each -OCH3 or together form -OCH2O-or -OCH2CH2O-, and pharmaceutically acceptable acid addition salts thereof are disclosed as calcium channel blockers useful for treating cardiovascular disorders, including angina, hypertension and congestive heart failure.