Palladium-Catalyzed Multicomponent Synthesis of Fully Substituted Alkylidene Furanones
作者:Ángel Rentería-Gómez、Rubén O. Torres-Ochoa、Rocío Gámez-Montaño、Qian Wang、Jieping Zhu
DOI:10.1021/acs.orglett.0c02578
日期:2020.9.4
In the presence of a catalytic amount of Pd(OAc)2 and XantPhos, the three-component reaction of ynones, imines, and aryl iodides affords fully substituted alkylidene-furan-3(2H)-ones via a sequence of the Mannich reaction followed by chemo- and regioselective oxypalladation and reductive elimination. One carbon–oxygen and two carbon–carbon bonds are generated to afford the heterocycle in good to excellent
1,2-Vinyl and 1,2-Acetylenyl Migration in Rh(II) Carbene Reaction: Remarkable Bystander Effect
作者:Weifeng Shi、Fengping Xiao、Jianbo Wang
DOI:10.1021/jo050173c
日期:2005.5.1
Rh(II)-catalyzed reaction was investigated. 1,2-Migration was the predominant reaction pathway, and the migratory aptitude was found to be dramatically affected by the β-substituents. The 1,2-vinyl and 1,2-acetylenyl group migration occurs preferentially in the presence of β-hydrogen in Rh2(OAc)4-catalyzed reaction of β-(trichloroacetyl)amino α-diazo carbonyl compounds. A possible reaction mechanism is discussed
CuSO4-catalyzed diazo decomposition in water: a practical synthesis of β-keto esters
作者:Mingyi Liao、Jianbo Wang
DOI:10.1016/j.tetlet.2006.10.059
日期:2006.12
CuSO4 was found to be an efficient catalyst for the diazo decomposition of β-hydroxy α-diazoesters in water. 1,2-H shift occurred efficiently to give β-ketoesters in high yields. No O–H bond insertion products were identified.
Asymmetric Transfer Hydrogenation of Functionalized Acetylenic Ketones
作者:Zhijia Fang、Martin Wills
DOI:10.1021/jo401284c
日期:2013.9.6
A systematic study of the asymmetric transfer hydrogenations of functionalized acetylenic ketones and diketones has been completed, together with a total synthesis of (S,S)-(-)-yashabushidiol B. In several cases, excellent enantioselectivities and yields were achieved.
A new method for the synthesis of 2-cyclopenten-1-one-5-carboxylic ester derivatives via Rh2(OAc)4-mediated intramolecular C–H insertion reaction of 4Z-β-vinyl-α-diazo β-ketoesters
作者:Guisheng Deng、Baihua Xu、Jianbo Wang
DOI:10.1016/j.tet.2005.05.106
日期:2005.11
2-Cyclopenten-1-one-5-carboxylic ester derivatives 14 are synthesized in a four- step-reaction sequence starting from alkynyl aldehydes 9 via 4Z-beta-vinyl-alpha-diazo beta-ketoesters intermediate 8. The synthetic method for 8 is described. When the delta substituent is an alkyl group, Rh(Il)-mediated decomposition of the diazo compounds 8 led to an intramolecular C-H insertion to afford 2-cyclopenten-1-one-5-carboxylic ester derivatives 14 in high yields. When the delta substituent is an aryl group, 2-hydroxynaphthoate 15 is obtained exclusively. In both cases, no Wolff rearrangement product was observed. (c) 2005 Elsevier Ltd. All rights reserved.