Stereoselective Rhodium-Catalyzed Isomerization of Stereoisomeric Mixtures of Arylalkenes
作者:Tao Li、Wanxiang Zhao、Hongxuan Yang、Wenke Dong、Wencan Wang
DOI:10.1055/s-0040-1707166
日期:2020.10
Abstract A new efficient method for the synthesis of a high ratio of E-alkenes from E/Z mixtures of alkenes with B2pin2 in the presence of a rhodium catalyst is described. This reaction features mild reaction conditions, broad functional group tolerance, and highly great application potential.
A direct and metal free one-pot method has been developed for the stereoselectivesynthesis of tetrahydropyrimidinone derivatives from a vinyl arene and formaldehyde using a tartaric acid–dimethylurea (TA : DMU) melt as a green reaction medium. The substrate scope of this method is very general and the tetrahydropyrimidinone (THPM) derivatives are synthesized in good yields with a high degree of diastereoselectivity
Reactions en milieu heterogene solide-liquide faiblement hydrate : la reaction de wittig dans le systeme hydroxydes alcalins/solvant organique aprotique
作者:Yves Le Bigot、Michel Delmas、Antoine Gaset
DOI:10.1016/s0040-4020(01)85886-5
日期:1988.1
The Wittig reaction carried out in a slighty hydrated solid-liquid media constituted by a solid alkaline hydroxyde and an organic phase which includes the phosphonium salt and the aldehyde leads easily to the corresponding alkene with very good yields specially with furanic aldehydes. The ylide formation at the interface appears as the most important step of this condensation.
Regioselective Annulation of 5-(1-Alkenyl)- and 5-Vinyl-1,3-benzodioxoles with 3-Chloro-3-cyclobutene-1,2-dione. Synthesis of 3,4-Dihydrocyclobuta[5,6]- naphtho[2,3-d][1,3]dioxole-1,2-diones and Cyclobuta[6,7]naphtho[2,3-d][1,3]dioxole- 1,2-diones
作者:Arthur H. Schmidt、Gunnar Kircher、Christian Kuenz、Steffen Wahl、Markus W. Hendriok
DOI:10.1021/jo00117a047
日期:1995.6
Reactions en milieu heterogene solide-liquide faiblement hydrate II-la reaction de wittig dans les systemes carbonates alcalins/solvant organique aprotique