Palladium-catalysed direct cross-coupling of secondary alkyllithium reagents
作者:Carlos Vila、Massimo Giannerini、Valentín Hornillos、Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1039/c3sc53047g
日期:——
Palladium-catalysed cross-coupling of secondary C(sp3) organometallic reagents has been a long-standing challenge in organic synthesis, due to the problems associated with undesired isomerisation or the formation of reduction products. Based on our recently developed catalytic C–C bond formation with organolithium reagents, herein we present a Pd-catalysed cross-coupling of secondary alkyllithium reagents with aryl and alkenyl bromides. The reaction proceeds at room temperature and on short timescales with high selectivity and yields. This methodology is also applicable to hindered aryl bromides, which are a major challenge in the field of metal catalysed cross-coupling reactions.
Palladium-Catalysed Direct Cross-Coupling of Organolithium Reagents with Aryl and Vinyl Triflates
作者:Carlos Vila、Valentín Hornillos、Massimo Giannerini、Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1002/chem.201404398
日期:2014.10.6
A palladium‐catalysed cross‐coupling of organolithiumreagents with aryl and vinyl triflates is presented. The reaction proceeds at 50 or 70 °C with short reaction times, and the corresponding products are obtained with moderate to high yields, with a variety of alkyl and (hetero)aryl lithium reagents.
A simple and efficient synthesis of 9-arylfluorenes via metal-free reductive coupling of arylboronic acids and N-tosylhydrazones in situ
作者:Xu Shen、Ningning Gu、Ping Liu、Xiaowei Ma、Jianwei Xie、Yan Liu、Lin He、Bin Dai
DOI:10.1039/c5ra12099c
日期:——
efficient synthesis method of 9-arylfluorenes via metal-freereductive coupling of N-tosylhydrazones and arylboronic acids has been developed. This methodology is realized by a one-pot protocol in two steps involving the preparation of N-tosylhydrazones by reacting tosylhydrazide with 9-fluorenone derivatives, followed by the reductive coupling of arylboronic acid in the presence of potassium carbonate to