Palladium-catalyzed aryl halide carbonylation–intramolecular O-enolate acylation: efficient isocoumarin synthesis, including the synthesis of thunberginol A
作者:Andrew C. Tadd、Mark R. Fielding、Michael C. Willis
DOI:10.1039/b917839b
日期:——
Exposure of a series of α-(o-haloaryl)-substituted ketones to palladium-catalyzed carbonylation conditions leads to the formation of the corresponding isocoumarins. Balloon pressure of CO is sufficient to achieve high yielding reactions, and both cyclic and acyclic ketones are efficient substrates. The utility of the method is illustrated by a short synthesis of the natural product thunberginol A.
Palladium-Catalyzed Synthesis of Isocoumarins and Phthalides via <i>tert</i>-Butyl Isocyanide Insertion
作者:Xiang-Dong Fei、Zhi-Yuan Ge、Ting Tang、Yong-Ming Zhu、Shun-Jun Ji
DOI:10.1021/jo302004u
日期:2012.11.16
efficient strategy for the synthesis of isocoumarins and phthalides through a palladium(0)-catalyzed reaction incorporating tert-butyl isocyanide has been developed. This process, providing one of the simplest methods for the synthesis of this class of valuable lactones, involves two steps including cyclization reaction and simple acid hydrolysis. The methodology is tolerant of a wide range of substrates
Palladium-catalysed intramolecular enolate O-arylation and thio-enolate S-arylation: synthesis of benzo[b]furans and benzo[b]thiophenes
作者:Michael C. Willis、Dawn Taylor、Adam T. Gillmore
DOI:10.1016/j.tet.2006.05.004
日期:2006.12
Enolates derived from alpha-(ortho-haloaryl)-substituted ketones undergo palladium-catalysed C-O bond formation to deliver benzofuran products in good yield. A catalyst generated from Pd-2(dba)(3) and the ligand DPEphos effects the key bond formation to deliver a variety of substituted products from both cyclic and acyclic precursors. The analogous thio-ketones undergo C-S bond formation using identical reaction conditions and are converted to benzothiophene products. A cascade sequence that produces the required a-aryl ketones in situ has also been developed, although the substrate scope is more restricted. (c) 2006 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Intramolecular <i>O</i>-Arylation of Enolates: Application to Benzo[<i>b</i>]furan Synthesis
作者:Michael C. Willis、Dawn Taylor、Adam T. Gillmore
DOI:10.1021/ol047993g
日期:2004.12.1
A catalyst generated from Pd-2(dba)(3) and the ligand DPEphos effects intramolecular C-O bond formation between enolates and aryl halides in the conversion of 1-(2-haloaryl)ketones directly into the corresponding benzofurans. Both cyclic and acyclic ketones are efficient substrates. Thio ketones can also be employed allowing the preparation of the corresponding benzothiophenes.
Palladium-Catalyzed Tandem Alkenyl and Aryl C?N Bond Formation: A Cascade N-Annulation Route to 1-Functionalized Indoles
作者:Michael C. Willis、Gareth N. Brace、Ian P. Holmes