Reductive C–O, C–N, and C–S Cleavage by a Zirconium Catalyzed Hydrometalation/β-Elimination Approach
作者:Christof Matt、Frederic Kölblin、Jan Streuff
DOI:10.1021/acs.orglett.9b02572
日期:2019.9.6
A zirconium catalyzed reductive cleavage of Csp3 and Csp2 carbon-heteroatom bonds is reported that makes use of a tethered alkene functionality as a traceless directing group. The reaction is successfully demonstrated on C-O, C-N, and C-S bonds and proposed to proceed via a hydrozirconation/β-heteroatom elimination sequence of an in situ formed zirconium hydride catalyst. The positional isomerization
Safe and Metal-Free Synthesis of 1-Alkenyl Aryl Sulfides and Their Sulfones from Thiiranes and Diaryliodonium Salts
作者:Jiaxi Xu、Jun Dong
DOI:10.1055/s-0036-1591559
日期:2018.6
These sulfides were further oxidized with performic acid to the corresponding sulfones. The current method provides a metal-free and safe method for the preparation of 1-alkenyl aryl sulfides and their sulfones. A series of 1-alkenyl aryl sulfides was synthesized from thiiranes and diaryliodonium salts in tetrahydrofuran in the presence of potassium tert-butoxide. The proposed reaction mechanism involves
The combination of copper(I)-Taniaphos (5 mol%) is an efficient Lewis acid catalyst for the promotion of the asymmetric 1,3-dipolarcycloaddition of azomethine ylides to arylvinylsulfones, providing 3-sulfonylpyrrolidines in good yields and with nearly complete exo-selectivity and good enantiocontrol (typically 65-85% ee). The transformation of the cycloadducts into cis-2,5-disubstituted pyrrolidines
Palladium-Catalyzed Synthesis of Aryl Vinyl Sulfides via 1,3-Oxathiolanes As Vinyl Sulfide Surrogates
作者:Jason R. Schmink、Summer A. Baker Dockrey、Tianyi Zhang、Naomi Chebet、Alexis van Venrooy、Mary Sexton、Sarah I. Lew、Steffany Chou、Ami Okazaki
DOI:10.1021/acs.orglett.6b03249
日期:2016.12.16
A nontraditional approach to synthesizing arylvinylsulfides is described. 2,2-Diphenyl-1,3-oxathiolane slowly liberates a vinylsulfide anion under basic conditions. Using a Pd/Xantphos catalyst system to activate a wide range of aryl bromides, this transient sulfide species can be effectively trapped and fed into a traditional Pd0/PdII catalytic cycle. Scope and limitations of the methodology are