Blue Light-Emitting Diode-Mediated <i>In Situ</i> Generation of Pyridinium and Isoquinolinium Ylides from Aryl Diazoesters: Their Application in the Synthesis of Diverse Dihydroindolizine
作者:Saibal Sar、Souvik Guha、Tejas Prabakar、Debajit Maiti、Subhabrata Sen
DOI:10.1021/acs.joc.1c01209
日期:2021.9.3
1/2, aryl diazoesters 3, and acrylic ester/3-alkenyl oxindoles 5/6 provide various dihydroindolizines 7 to 9 in excellent yield. The principle of the strategy is photolytic generation of nitrogen ylidesfrom N-heteroarenes and aryl diazoesters and their subsequent [3 + 2] cycloaddition reaction with dipolarophiles. Detailed mechanistic analysis of the transformation through control experiments establishes
3-Azabicyclo[3.1.0]hexane derivatives useful in therapy
申请人:Pfizer INC
公开号:US06313312B1
公开(公告)日:2001-11-06
Compounds of formula (I), their salts and prodrugs thereof, where the substituents are as defined herein are disclosed as opiate binding agents useful in the treatment of opiate-mediated conditions. Also described are processes for making such substances.
A Rh(III)-catalyzed regioselective intermolecular carbenoid insertion into the N-methylene Csp3–H bond of acyclic aliphatic amides has been achieved, taking advantage of bidentate–chelation assistance. This methodology has been successfully applied to a broad range of linear and branched-chain N-alkylamides, thus providing a practical method for the assembly of diverse beta-amino esters. Mechanism
Cp*Co(III)-catalysed selective alkylation of directed C–H bonds of arenes and heteroarenes has been accomplished employing donor–acceptor carbenes, derived from α-diazocarbonyl compounds. The developed method allows ready access to various substituted α-(hetero)aryl-α-arylacetic acid derivatives in good to excellent yields. Synthetic utility was also shown through the synthesis of a substituted indole
Rhodium Catalyzed Arylation of Diazo Compounds with Aryl Boronic Acids
作者:Jayanta Ghorai、Pazhamalai Anbarasan
DOI:10.1021/jo502922r
日期:2015.4.3
general and efficient synthesis of diarylacetate, a diarylmethine derivative, was accomplished through rhodium catalyzed directarylation of diazo compounds with arylboronic acids. The reaction tolerates various boronicacid derivatives and functional groups. Notably, chemoselective arylation of diazo compounds over other electrophiles were demonstrated. The efficacy of the developed methodology is shown