Copper Mediated Formation of Carbon-Heteroatom Bonds Using Organoboron Reagents and Ultrasound
摘要:
This report summarizes research efforts focused on copper acetate mediated reactions to form new carbon-heteroatom bonds using organoboron reagents under ultrasound irradiation. The method involves the application of ultrasound irradiation to the Chan-Evans-Lam reaction to achieve O-arylation of phenols, N-arylation of anilines and indoles, and S-arylation of thiols. Ultrasound irradiation was found to decrease reaction times from 72 hours to 4 hours while improving the product yields an average of 20%(1) Representative C-O, C-N, and C-S coupling reactions were successfully scaled-up from the milligram to gram levels while maintaining good product yields offering potential applications in industrial processes.
Palladium-Catalyzed Carbon−Sulfur Cross-Coupling Reactions with Indium Tri(organothiolate) and Its Application to Sequential One-Pot Processes
作者:Jae-Young Lee、Phil Ho Lee
DOI:10.1021/jo801169h
日期:2008.9.19
tri(organothiolate) is an effective nucleophilic coupling partner in Pd-catalyzedC-Scross-coupling reactions to produce the functionalized sulfides in excellent yields with high atom efficiency and complete regio- and chemoselectivity. The present method was efficiently applied to the sequential one-pot processes composed of selective double C-Scross-coupling reactions and addition of allylindium or allenylindium
Cross-Coupling of Chloro(hetero)arenes with Thiolates Employing a Ni(0)-Precatalyst
作者:Paul H. Gehrtz、Valentin Geiger、Tanno Schmidt、Laura Sršan、Ivana Fleischer
DOI:10.1021/acs.orglett.8b03476
日期:2019.1.4
aryl chlorides and in situ generated aliphatic and aromatic thiolates is described. The employed on-cycle, air-stable defined Ni precatalysts allow for transformation of a broad scope of substrates. A variety of functional groups and heterocyclic motifs as well as structurally varied thiols are tolerated at unprecedented moderate catalyst loadings and reaction temperatures. Depending on reaction conditions