Regiocontrolled Palladium-Catalyzed Arylative Cyclizations of Alkynols
作者:Daishi Fujino、Hideki Yorimitsu、Atsuhiro Osuka
DOI:10.1021/ja5029028
日期:2014.4.30
Tuning the reactivity of arylpalladium intermediates enables control of catalyticarylative 5-exo and 6-endo cyclizations of alkynols. The two modes of cyclizations represent a rare example of controllable, regioselective difunctionalization of alkynes. The cyclizations are useful in offering a divergent synthesis of oxygen-containing heterocycles, which is of synthetic use for further derivatization
Direct Access to 1,1-Dicarbonyl Sulfoxonium Ylides from Aryl Halides or Triflates: Palladium-Catalyzed Carbonylation
作者:Yang Yuan、Xiao-Feng Wu
DOI:10.1021/acs.orglett.9b01926
日期:2019.7.5
The synthesis of 1,1-dicarbonyl sulfoxonium ylides by palladium-catalyzed carbonylation of aryl halides or triflates with α-carbonyl sulfoxonium ylides has been developed for the first time. This method provides a general approach to synthetically useful 1,1-dicarbonyl sulfoxonium ylides in high efficiency. The protocol displays a wide substrate scope, showing that the resulting 1,1-dicarbonyl sulfoxonium
Highly stereoselective and catalytic desulfitative C O and C I dienylation with sulfolenes: The importance of basic additives
作者:Hang T. Dang、Viet D. Nguyen、Hoang H. Pham、Hadi D. Arman、Oleg V. Larionov
DOI:10.1016/j.tet.2019.04.012
日期:2019.6
organic synthesis and materials science. We describe herein a palladium-catalyzeddienylation of aryl, heteroaryl, and vinyl triflates, nonaflates and iodides that were previously identified as recalcitrant substrates for the sulfolene-mediated catalytic dienylation. The method has now been successfully expanded to C-O and C-I dienylation, demonstrating broad scope with respect to sulfonates, iodides
A general intermolecular reductive Heckreaction of organohalides with both terminal and internal unactivated aliphatic alkenes has been first realized in high yield with complete anti-Markovnikov selectivity. The challenging vinyl bromides, aryl chlorides, and polysubstituted internal alkenes were first applied. More than 100 remote carbofunctionalized alkyl carboxylic acid derivatives were rapidly
Pd-Catalyzed Synthesis of Aryl and Heteroaryl Triflones from Reactions of Sodium Triflinate with Aryl (Heteroaryl) Triflates
作者:Lynette A. Smyth、Eric M. Phillips、Vincent S. Chan、José G. Napolitano、Rodger Henry、Shashank Shekhar
DOI:10.1021/acs.joc.5b02523
日期:2016.2.5
A novel method for Pd-catalyzed triflination of aryl and heteroaryl triflates using NaSO2CF3 as the nucleophile is described. The combination of Pd2(dba)3 and RockPhos formed the most effective catalyst. A broad range of functional groups and heteroaromatic compounds were tolerated under the neutral reaction conditions. The order of reactivity ArOTf ≥ ArCl ≥ ArBr is consistent with transmetalation