Abstract A novel and convenient protocol for the synthesis of sulfonate derivatives via DABCO-catalyzed direct sulfonylation of 1-sulfonyl-1,2,3-triazoles to different enols has been established. This synthetic route could effectively avoid the use of transition metal catalysts and extra oxidants, and the target products could be obtained in good to excellent yields (75-86%) with wide substrate scope
Nickel-Catalyzed Cross-Coupling Reactions of 4-Mesylcoumarins with Aryl Halides: Facile Synthesis of 4-Substituted Coumarins
作者:Guo-Qiang Lin、Jian-Guang Lei、Ming-Hua Xu
DOI:10.1055/s-2004-832818
日期:——
nickel-catalyzed cross-couplingreaction between 4-mesylcoumarins and arylhalides was developed to give a number of 4-arylcoumarins in good yield under mild conditions. Unlike the previously reported coupling examples, this new method allows the direct cross-coupling of 4-mesylcoumarins with aryl- or vinyl halides in the NiCl 2 (PPh 3 ) 2 /PPh 3 /Zn/toluene system. This has greatly facilitated the synthesis of