TMSOTf-catalyzed intramolecular seleno-arylation of tethered alkenes: A novel method for the solid-phase synthesis of dihydrocoumarins and coumarins
摘要:
TMSOTf-catalyzed intramolecular seleno-arylation of tethered alkenes was performed using polystyrene-supported succinimidyl selenide as the selenium source. This catalytic process provides an efficient method for the regioselective synthesis of dihydrocoumarins possessing a seleno-functionality, followed by traceless cleavage of selenium linker to provide dihydrocoumarins and coumarins in good yields and purities. (C) 2012 E Tang. Published by Elsevier B.V on behalf of Chinese Chemical Society. All rights reserved.
Nickel-Catalyzed C–CN Bond Formation via Decarbonylative Cyanation of Esters, Amides, and Intramolecular Recombination Fragment Coupling of Acyl Cyanides
An efficientnickel-catalyzed decarbonylative cyanation reaction which allows the direct functional-group interconversion of readily available esters into the corresponding nitriles was developed. This reaction successfully offers access to structurally diverse nitriles with high efficiency and excellent functional-group tolerance and provides a good alternative to classical synthetic pathways from
NHC/Iron cooperative catalysis: aerobic oxidative esterification of aldehydes with phenols
作者:R. Sudarshan Reddy、João N. Rosa、Luís F. Veiros、Stephen Caddick、Pedro M. P. Gois
DOI:10.1039/c1ob05151b
日期:——
An NHC/iron cooperative catalytic system mediates the aerobicoxidativeesterification of aldehydes with phenols. The use of equimolar amounts of reactants led to good to excellent isolated yields of esters.
Dinuclear Zinc-Catalyzed Asymmetric Tandem Reaction of α-Hydroxy-1-indanone: Access to Spiro[1-indanone-5,2′-γ-butyrolactones]
作者:Meng-Meng Liu、Xiao-Chao Yang、Yuan-Zhao Hua、Jun-Biao Chang、Min-Can Wang
DOI:10.1021/acs.orglett.9b02658
日期:2019.9.6
A highly efficient method for the enantioselective build of spiro[1-indanone-5,2'-γ-butyrolactones] has been developed through the tandem Michael/transesterificationreaction of α-hydroxy-1-indanone and α,β-unsaturated esters. A broad range of spiro(1-indanone-butyrolacones) with contiguous stereocenters have been synthesized with excellent stereoselectivities (up to >20:1 dr, up to >99% ee) under