Sustainable Palladium-Catalyzed Tsuji–Trost Reactions Enabled by Aqueous Micellar Catalysis
作者:Nicholas R. Lee、Farbod A. Moghadam、Felipe C. Braga、Daniel J. Lippincott、Bingchun Zhu、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1021/acs.orglett.0c01329
日期:2020.7.2
reactions, can be run under micellarcatalysis conditions featuring not only chemistry in water but also numerous combinations of reaction partners that require low levels of palladium, typically on the order of 1000 ppm (0.1 mol %). These couplings are further characterized by especially mild conditions, leading to a number of cases not previously reported in an aqueous micellar medium. Inclusion of diverse
A One-Pot Reaction toward the Diastereoselective Synthesis of Substituted Morpholines
作者:Thomas Aubineau、Janine Cossy
DOI:10.1021/acs.orglett.8b03141
日期:2018.12.7
The diastereoselectivesynthesis of various substituted morpholines has been achieved from vinyloxiranes and amino-alcohols under sequential Pd(0)-catalyzed Tsuji–Trost/Fe(III)-catalyzed heterocyclization. Using the same strategy, 2,6-, 2,5-, and 2,3-disubstituted as well as 2,5,6- and 2,3,5-trisubstituted morpholines were obtained in good to excellent yields and diastereoselectivities.
Synthesis of Highly Functionalized Allylic Alcohols from Vinyl Oxiranes and <i>N</i>-Tosylhydrazones via a Tsuji–Trost-Like “Palladium–Iodide” Catalyzed Coupling
作者:Stefano Parisotto、Annamaria Deagostino
DOI:10.1021/acs.orglett.8b03026
日期:2018.11.2
An unprecedented efficient palladium(0)-catalyzed reaction of vinyl oxiranes with N-tosylhydrazones, affording “skipped” allylicalcohols in total regioselectivity and stereoselectivity, with excellent functional-group compatibility, is reported. In this Tsuji–Trost-like allylation, we propose the use of N-tosylhydrazones as a synthetic equivalent of α-styryl anions. More than 20 new products are described
New mechanistic aspects on the catalytic transformation of vinylthiiranes to mono and disubstituted 3,6-dihydro-1,2-dithiins by tungsten pentacarbonyl monoacetonitrile
作者:David W Lupton、Dennis K Taylor
DOI:10.1016/s0040-4020(02)00398-8
日期:2002.5
alkyl and aryl mono- and disubstituted 3,6-dihydro-1,2-dithiins have been synthesised from their corresponding vinylthiiranes exploiting Adams' tungsten pentacarbonyl monoacetonitrile catalytic transformation. New conclusions pertaining to the rate determining step, the sensitivity of the process to precursor sterics and electronics, and the nature of various reaction intermediates are highlighted.
Highly Regioselective Rearrangement of 2-Substituted Vinylepoxides Catalyzed by Gallium(III) Triflate
作者:Xian-Ming Deng、Xiu-Li Sun、Yong Tang
DOI:10.1021/jo050810z
日期:2005.8.1
Gallium(III) triflatecatalyzed the rearrangement of 2-substituted vinylepoxides into β,γ-unsaturated carbonyl compounds with high regio- and chemoselectivity (>97/3) in lowcatalystloading (1−5 mol %). The alkyl-substituted trimethylsilylvinyl epoxides gave β,γ-unsaturated ketone, but aryl-substituted vinylepoxides gave the aldehydes instead.