An efficient and versatile tandem process of acetalization and cycloisomerization reactions has been developed for the reactions of 1-alkynyl-2-carbonylquinoline substrates. The reaction occurs thanks to Au(I) and Ag(I) catalysis. Silver(I) catalysis has been extensively studied (11 different silver species) on a broad range of quinoline derivatives (variation of alkyne substituent, of carbonyl function
Organocatalytic Enantio- and Diastereoselective Synthesis of 1,2-Dihydronaphthalenes from Isobenzopyrylium Ions
作者:Hui Qian、Wanxiang Zhao、Zhaobin Wang、Jianwei Sun
DOI:10.1021/ja509824j
日期:2015.1.21
efficient asymmetricsynthesis of dihydronaphthalenes is disclosed. The process represents a new addition to the limited asymmetricreactions of isobenzopyryliums, a family of versatile 10π-electron aromatic species. Excellent asymmetric induction is achieved for the first time without an anchoring group in the 4-position or a metal catalyst, both of which were required previously in these reactions. The
Synthesis of 1-(Alkoxycarbonyl)methylene-1,3-dihydroisobenzofurans and 4-(Alkoxycarbonyl)benzo[c]pyrans by Palladium-Catalysed Oxidative Carbonylation of 2-Alkynylbenzyl Alcohols, 2-Alkynylbenzaldehydes and 2-Alkynylphenyl Ketones
作者:Alessia Bacchi、Mirco Costa、Nicola Della Cà、Marcella Fabbricatore、Alessia Fazio、Bartolo Gabriele、Cristina Nasi、Giuseppe Salerno
DOI:10.1002/ejoc.200300577
日期:2004.2
A direct synthesis of 1-(alkoxycarbonyl)methylene-1,3-dihydroisobenzofurans 2 and 5 and 4-(alkoxycarbonyl)benzo[c]pyrans 3 and 6 by oxidative Pd-catalysed cyclization/alkoxycarbonylation of 2-alkynylbenzyl alcohols 1, and of 2-alkynylbenzaldehydes or 2-alkynylphenyl ketones 4 is reported. Reactions were carried out in ROH or CH3CN/ROH (R = Me, iPr) as the solvent at 70−105 °C in the presence of catalytic
report the isolation of such gold(I)- and gold(III)-bound isobenzopyrylium intermediates, and two of them have been characterized by X-ray diffraction analysis. When reacting with reaction partners, such as styrene and phenyl acetylene, the Au(I) intermediate exhibited a reaction rate much faster than that of the Au(III) species. A degradation pathway of active Au(III)–carbene intermediate was observed