N-Heterocyclic Carbene Derived Nickel-Pincer Complexes: Efficient and Applicable Catalysts for Suzuki-Miyaura Coupling Reactions of Aryl/Alkenyl Tosylates and Mesylates
作者:Jun-ichi Kuroda、Kiyofumi Inamoto、Kou Hiroya、Takayuki Doi
DOI:10.1002/ejoc.200900067
日期:2009.5
activities of NHC-derived nickel–pincercomplexes for the Suzuki–Miyauracouplingreactions of aryl/alkenyltosylates and mesylates are described. In the presence of a catalytic amount of nickelacycle 1a, a wide array of tosylates and mesylates reacted with several aryl- and alkenylboronic acids to afford the coupling products, generally in high yields. Fine tuning of the reaction conditions for each class
4-thio substituted coumarin derivatives and coumarin dimers are provided, as well as processes for their preparation. A synthetic process for the preparation of 4-thio substituted coumarin derivatives is provided using mild reaction conditions, which maintains a high substituent tolerance and is appropriate for use in solid phase syntheses for producing a library of 4-thio substituted coumarin derivatives for biological screening.
A versatile palladium catalyst system for Suzuki–Miyaura coupling of alkenyl tosylates and mesylates
作者:Pui Yu Wong、Wing Kin Chow、Kin Ho Chung、Chau Ming So、Chak Po Lau、Fuk Yee Kwong
DOI:10.1039/c1cc12240a
日期:——
A general and effectivepalladium system for Suzuki-Miyaura coupling of alkenyl electrophiles under mild reaction conditions is reported. With the Pd(OAc)(2)/CM-phos system, a variety of alkenyltosylates are coupled well with ArB(OH)(2). Moreover, the first successful examples of using alkenyl mesylates in alkenylation are also described.
A quick and flexible synthetic approach to enureas (alkenyl ureas) via the Pd-catalyzed C–N coupling reaction of alkenyl tosylates and mesylates
作者:Jignesh P. Dalvadi、Poojan K. Patel、Kishor H. Chikhalia
DOI:10.1039/c3ra44195d
日期:——
As part of our persistent exploration to elucidate the chemistry of Pd-catalyzed CâN coupling, a catalyst system for the coupling reaction of alkenyl tosylates or mesylates with a variety of ureas has been developed. This catalyst system boasts outstanding functional group tolerance and enables the quick synthesis of the entire series of enurea analogs via Pd-catalyzed CâN coupling reactions in excellent yields.
Pd-catalyzed cross-coupling reactions of less activated alkenyl electrophiles (for tosylates and mesylates) with tosylhydrazones: synthesis of various 1,3-dienes
作者:Poojan K. Patel、Jignesh P. Dalvadi、Kishor H. Chikhalia
DOI:10.1039/c4ra09012h
日期:——
Palladium catalyzed cross coupling reaction engaging N-tosylhydrazones of corresponding ketones as a nucleophilic coupling partner and various alkenyl tosylates and mesylates as an electrophiles for the synthesis of various alkenyl derivatives. The salient features of this reactions are (1) no stoichiometric organometallic reagents required, (2) it tolerates a wide range of functional groups, (3) easy