N-Heterocyclic Carbene-Catalyzed Construction of 1,3,5-Trisubstituted Benzenes from Bromoenals and α-Cyano-β-methylenones
作者:Chun-Lin Zhang、Song Ye
DOI:10.1021/acs.orglett.6b03306
日期:2016.12.16
A direct and efficient approach to 1,3,5-trisubstituted benzenes has been developed via N-heterocycliccarbene-catalyzed [2 + 4] annulation of α-bromoenals and α-cyano-β-methylenones. The reaction worked well for both aryl- and alkylenones.
Direct Assembly of Polysubstituted Naphthalenes via a Tandem Reaction of Benzynes and α-Cyano-β-methylenones
作者:Qiang Wang、Yi An、Guangfen Du、Zhi-Hua Cai、Bin Dai、Lin He
DOI:10.1021/acs.joc.0c01975
日期:2020.11.6
A mild and transition-metal-free benzannulation reaction for the construction of the naphthalene skeleton has been described. Benzynes react with α-cyano-β-alkylenones through a tandem nucleophilic addition/cyclization/aromatization process to afford polysubstituted naphthalenes in 50–94% yields.
The radical cascade protocol of the alpha-cyano alpha-TMS/aryl-capped alkynyl aryl ketones promoted by tert-butyl hydroperoxide under catalysis with tetrabutylammonium iodide in refluxing benzene has been developed, leading to the construction of a variety of highly functionalized [6,6,5] tricyclic frameworks in an efficient manner.