A novel efficient synthesis of 2,4-diarylpyrimidines was developed based on phosphonium-mediated Suzuki coupling of 2-(methylsulfanyl)pyrimidin-4(3 H )-one (at position 4) followed by the Liebeskind–Srogl cross-coupling (at position 2) under microwave irradiation.
Cobalt-catalyzed activation of methylthio-substituted N-heterocycles facilitates either cross-coupling reactions with aryl- or benzylzinc compounds or synthesis of the corresponding zinc compounds.
钴催化活化甲硫基取代的N-杂环化合物促进与芳基或苄基锌化合物的交叉偶联反应,或相应锌化合物的合成。
New Air-Stable Catalysts for General and Efficient Suzuki−Miyaura Cross-Coupling Reactions of Heteroaryl Chlorides
作者:Anil S. Guram、Anthony O. King、John G. Allen、Xianghong Wang、Laurie B. Schenkel、Johann Chan、Emilio E. Bunel、Margaret M. Faul、Robert D. Larsen、Michael J. Martinelli、Paul J. Reider
DOI:10.1021/ol060268g
日期:2006.4.1
[reaction: see text] New air-stable PdCl(2)P(t)Bu(2)(p-R-Ph)}(2) (R = H, NMe(2), CF(3),) complexes represent simple, general, and efficient catalysts for the Suzuki-Miyauracross-couplingreactions of aryl halides including five-membered heteroaryl halides and heteroatom-substituted six-membered heteroaryl chlorides with a diverse range of arylboronic acids. High product yields (89-99% isolated yields)
New Catalysts for Suzuki−Miyaura Coupling Reactions of Heteroatom-Substituted Heteroaryl Chlorides
作者:Anil S. Guram、Xiang Wang、Emilio E. Bunel、Margaret M. Faul、Robert D. Larsen、Michael J. Martinelli
DOI:10.1021/jo070341w
日期:2007.7.1
PdCl2PR2(Ph-R‘)}2 complexes, readily prepared from commercial reagents, exhibit unique efficiency as catalysts for the Suzuki−Miyauracoupling reactions of a variety of heteroatom-substituted heteroarylchlorides with a diverse range of aryl/heteroaryl boronic acids. The coupling reactions catalyzed by the new complexes exhibit high product yields (88−99%) and high catalyst turnover numbers (up to
Synthesis of Pyrimidinyl Triflates and Palladium-catalyzed Coupling with Organotion and Organozic Reagents
作者:Jessie Sandosham、Kjell Undheim
DOI:10.3987/com-93-s39
日期:——
Pyrimidinyl triflates have been synthesized from pyrimidinones using triflic anhydride in the presence of triethylamine. The triflates, in the pyrimidine electrophilic positions, are versatile intermediates for substitution reactions. Carbon substituents are readily introduced in any position by Pd-catalyzed coupling reactions between pyrimidinyl triflates and aryl- or alkenyltin or with the corresponding organozinc reagents. Organozinc reagents are generally more reactive in coupling reaction and will effect the introduction of alkyl substituents.