Sequential bicyclization of biphenyl acetamides promoted by (COCl)2/SnCl4. Total synthesis of 4,5-dioxoaporphines
摘要:
The reaction of biphenyl acetamides with excess of oxalyl chloride/stannyl chloride offers a one pot, high-yield entry to 4,5-dioxoaporphine alkaloids. This strategy has been applied to the synthesis of 4,5-dioxodehydrocorydine starting from 1-iodo-2,3-dimethoxybenzene. The cytotoxicity of tetraoxygenated 4,5-dioxoaporphines has been evaluated. (C) 1997 Elsevier Science Ltd.
Fe-catalyzed difunctionalization of aryl titanates via double C–H activation has been developed, where aryl titanates were arylated via ortho C–H activation, followed by ipso electrophilic trapping of the C–Ti bond. The ortho C–H arylation should be promoted by a 1,2-Fe/Ti synergistic heterobimetallic arylene intermediate and represents an ortho C–H ferration directed by a readily transformable C–Ti group
作者:Thomas Sephton、Jonathan M. Large、Louise S. Natrajan、Sam Butterworth、Michael F. Greaney
DOI:10.1002/anie.202407979
日期:2024.8.26
A photocatalytic, XAT mediated Smiles-Truce biaryl synthesis is described. The reaction uses mild methods to generate and chemoselectively harness capricious aryl radicals, efficiently furnishing valuable biaryl products. The reaction utilises a simple yet underexplored amide linker, which enables a challenging formal C−N arylation of anilines.