Selective CS bond cleavage of a β-sultam ring was achieved by the reactions with Lewis acids. Aryl ketones or aldehyde were provided from 3-aryl-β-sultams whereas β-sultams bearing a poorly migratory substituent at C-3 gave trans-1,2,3-oxathiazolidine 2-oxides and/or cis-aziridines. These reactions were influenced by the cation-stabilizing capability of C-4 substituents and by the configuration of
The tetramethylammonium-hydroxide-catalyzed oxidative coupling of amines and alcohols has been described for the synthesis of several heterocycles under metal-free conditions by utilizing oxygen from air as the terminaloxidant.
Manganese(III) Porphyrin‐Catalyzed Dehydrogenation of Alcohols to form Imines, Tertiary Amines and Quinolines
作者:Kobra Azizi、Sedigheh Akrami、Robert Madsen
DOI:10.1002/chem.201900737
日期:2019.5.2
Manganese(III) porphyrin chloride complexes have been developed for the first time as catalysts for the acceptorless dehydrogenative coupling of alcohols and amines. The reaction has been applied to the direct synthesis of imines, tertiary amines and quinolines where only hydrogen gas and/or water are formed as the by‐product(s). The mechanism is believed to involve the formation of a manganese(III) alkoxide
Application of Sequential Cu(I)/Pd(0)-Catalysis to Solution-Phase Parallel Synthesis of Combinatorial Libraries of Dihydroindeno[1,2-<i>c</i>]isoquinolines
作者:Sarvesh Kumar、Thomas O. Painter、Benoy K. Pal、Benjamin Neuenswander、Helena C. Malinakova
DOI:10.1021/co200027c
日期:2011.9.12
methodology is compatible with a wide-range of aliphatic linear, branched, and ester functionalized N-substituents. Unexpectedly, the formation of regioisomers featuring a 1,2,3-contiguous substitution pattern in the aromatic ring of the indene core was observed. Three distinct combinatorial libraries with a total of 111 of members were synthesized, and 80 highly substituted dihydroindenoisoquinolines structurally
Vanadium- and Chromium-Catalyzed Dehydrogenative Synthesis of Imines from Alcohols and Amines
作者:Yulong Miao、Simone V. Samuelsen、Robert Madsen
DOI:10.1021/acs.organomet.1c00123
日期:2021.5.10
Vanadium(IV) tetraphenylporphyrin dichloride and chromium(III) tetraphenylporphyrin chloride have been developed as catalysts for the acceptorless dehydrogenation of alcohols. The catalysts have been applied to the direct synthesis of imines in overall good yields from a variety of alcohols and amines. The transformations are proposed to proceed by metal–ligand bifunctional pathways with an outer-sphere