Metal-Free Radical Annulation of Oxygen-Containing 1,7-Enynes: Configuration-Selective Synthesis of (<i>E</i>)-3-((Arylsulfonyl)methyl)-4-Substituted Arylidenechromene Derivatives
作者:Kaimin Mao、Mouwang Bian、Lei Dai、Jinghang Zhang、Qiuyu Yu、Chang Wang、Liangce Rong
DOI:10.1021/acs.orglett.0c03946
日期:2021.1.1
A novel strategy for the synthesis of (E)-3-((arylsulfonyl)methyl)-4-substituted benzylidenechromene derivatives via a metal-free radical annulation reaction of oxygen-containing 1,7-enynes with thiosulfonates has been developed. The reaction shows broad substrate scope, wide functional group tolerance, and moderate to excellent yields. Moreover, thiosulfonates were well driven to achieve the bifunctionalization
Arachidonic acid analogues, processes for their preparation and their
申请人:Beecham Group p.l.c.
公开号:US04699995A1
公开(公告)日:1987-10-13
A compound of formula (I): ##STR1## or a salt thereof, in which Y is a group--O(CH.sub.2).sub.m CH<, --(CH.sub.2).sub.m CH<, or --CH.dbd.C< where m is an integer of from 1 to 5, n is an integer of from 4 to 12, each of R.sup.1 and R.sup.2, which may be the same or different, represents hydrogen or C.sub.1-6 alkyl, X represents a double or triple bond, and each of A and B represents hydrogen when X is a double bond, or both A and B are absent when X is a triple bond, is useful in treating allergic diseases.
A General Synthesis of Alkenyl‐Substituted Benzofurans, Indoles, and Isoquinolones by Cascade Palladium‐Catalyzed Heterocyclization/Oxidative Heck Coupling
作者:Rosana Álvarez、Claudio Martínez、Youssef Madich、J. Gabriel Denis、José M. Aurrecoechea、Ángel R. de Lera
DOI:10.1002/chem.201001535
日期:2010.11.8
consecutive Sonogashira and cascade Pd‐catalyzedheterocyclization/oxidativeHeckcouplings from readily available ortho‐iodosubstituted phenol, aniline, and benzamide substrates, alkynes, and functionalized olefins. The cyclization of O‐ and N‐heteronucleophiles follows regioselective 5‐endo‐dig‐ or 6‐endo‐dig‐cyclization modes, whereas the subsequent Heck‐type coupling with both mono‐ and disubstituted
Treatment of 2-alkynylphenol with an alkyl Grignard reagent in the presence of a catalytic amount of manganese(II) chloride provided 2-(2-alkyl-1-alkenyl)phenol in good yield. Alkylmagnesation proceeded with high regio- and stereoselectivities.
Abstract Cyclization–carbonylation–cyclizationcouplingreactions (CCC-coupling reactions) of N-propargylanilines and o-alkynylphenols catalyzed by (box)Pd(II) complexes afforded symmetrical bis(quinolin-3-yl) and bis(benzofuran-3-yl) ketones, respectively, in moderate to excellent yields. Cyclization–carbonylation–cyclizationcouplingreactions (CCC-coupling reactions) of N-propargylanilines and o-alkynylphenols