Palladium-catalyzed reactions of vinyl bromides with disubstituted alkynes: a new synthesis of fulvenes
作者:Lee J. Silverberg、Guangzhong Wu、Arnold L. Rheingold、Richard F. Heck
DOI:10.1016/0022-328x(91)80026-g
日期:1991.6
reaction of vinylic bromides with disubstituted acetylenes at 100°C in the presence of triethylamine produces penta- or hexa-substituted fulvenes in low to moderate yields. Reactions with 3-hexyne under the same conditions usually yield dialkylidenecyclopentenes as products, apparently by rearrangement of the expected fulvenes. Fulvenes formed from the reaction of disubstituted alkynes with Z-2-bromovinyl
Palladium(II)-Catalyzed Oxidative Decarboxylative [2 + 2 + 1] Annulation of Cinnamic Acids with Alkynes: Access to Polysubstituted Pentafulvenes
作者:Shiyong Peng、Nuan Chen、Hong Zhang、Min He、Hongguang Li、Ming Lang、Jian Wang
DOI:10.1021/acs.orglett.0c01955
日期:2020.7.17
An unprecedented palladium(II)-catalyzed oxidative decarboxylative [2 + 2 + 1] annulation of cinnamic acids with alkynes has been developed for the synthesis of polysubstituted pentafulvenes. Ag2CO3 and DMSO are essential for the reaction. This protocol features readily available starting materials, a wide substrate scope, and moderate to excellent yields. Moreover, various significant frameworks can
已开发出前所未有的钯(II)催化的肉桂酸与炔烃的氧化脱羧[2 + 2 +1]环合反应,用于合成多取代的五烯酮。Ag 2 CO 3和DMSO对反应至关重要。该协议的特点是容易获得的起始原料,广泛的底物范围以及中等至极好的产率。而且,可以通过氧化,还原和Scholl型反应从五烯丙基戊烯的后期转化中容易地获得各种重要的构架。
Construction of polysubstituted pentafulvenes <i>via</i> palladium-catalyzed deacetylation of enones
作者:Ling-Jun Li、Xing Wang、Hui Xu、Hui-Xiong Dai
DOI:10.1039/d2cc06644k
日期:——
Herein, we report an efficient synthetic method for polysubstituted pentafulvenes via palladium-catalyzed deacetylative [2+2+1] annulation of enones with alkynes. Aryl-, alkenyl-, and alkyl-substituted α,β-enones were suitable substrates, affording the pentafulvene products in moderate to good yields. This protocol shows excellent compatibility with sensitive halides, free hydroxyl groups, and heterocycles