Carbon−Carbon Formation via Ni-Catalyzed Suzuki−Miyaura Coupling through C−CN Bond Cleavage of Aryl Nitrile
摘要:
The Suzuki-Miyaura coupling of aryl nitriles with aryl/alkenyl boronic esters is reported. With this method, the cyano group could be applied as a protecting group of arenes and finally as a leaving group to further construct polyaryl scaffolds.
Ruthenium‐catalyzed selective monoalkenylation of ortho CO or CN bonds of aromatic ketones was achieved. The reaction allowed the direct comparison of the relative reactivities of the cleavage of different carbon‐heteroatom bonds, thus suggesting an unconventional chemoselectivity, where smaller, more‐electron‐donating groups are more easily cleaved. Selective monofunctionalization of CO bonds in
Rhodium catalysed dehydrogenative borylation of vinylarenes and 1,1-disubstituted alkenes without sacrificial hydrogenation—a route to 1,1-disubstituted vinylboronates
作者:R. Benjamin Coapes、Fabio E. S. Souza、Rhodri Ll. Thomas、Jonathan J. Hall、Todd B. Marder
DOI:10.1039/b211789d
日期:2003.2.20
The complex trans-[Rh(Cl)(CO)(PPh3)2] (1) is an efficient catalyst precursor for the dehydrogenative borylation of alkenes without consumption of half the alkene substrate by hydrogenation, giving useful vinylboronate esters including 1,1-disubstituted derviatives that cannot be made by alkyne hydroboration.
Enantioselective Hydroarylation or Hydroalkenylation of Benzo[<i>b</i>]thiophene 1,1-Dioxides with Organoboranes
作者:Fangdong Hu、Jie Jia、Ximing Li、Ying Xia
DOI:10.1021/acs.orglett.0c04114
日期:2021.2.5
protocol for the asymmetric hydroarylation and hydroalkenylation of benzo[b]thiophene 1,1-dioxides with organoboranes has been developed. The combination of a rhodium(I) precatalyst and a chiral diene ligand constitutes the catalytic system, which enables the facile synthesis of 2,3-dihydrobenzo[b]thiophene 1,1-dioxides in good yields with high enantioselectivities. The merging of this asymmetric hydroarylation
已开发出一种有效的方案,用于有机硼烷对苯并[ b ]噻吩1,1-二氧化物的不对称加氢芳基化和加氢烯基化反应。铑(I)预催化剂和手性二烯配体的组合构成了催化体系,该体系能够以高收率和高对映选择性轻松合成2,3-二氢苯并[ b ]噻吩1,1-二氧化物。该不对称氢芳基化与下游烷基化的合并以非对映异构的方式提供了包含两个具有高对映选择性的连续的季立体中心的2,3-二氢苯并[ b ]噻吩1,1-二氧化物。
Rhodium catalysed dehydrogenative borylation of alkenes: Vinylboronates via C–H activation
作者:Ibraheem A. I. Mkhalid、R. Benjamin Coapes、S. Natasha Edes、David N. Coventry、Fabio E. S. Souza、Rhodri Ll. Thomas、Jonathan J. Hall、Si-Wei Bi、Zhenyang Lin、Todd B. Marder
DOI:10.1039/b715584k
日期:——
We present herein a high yield, highly selective catalytic synthesis of vinylboronate esters (VBEs), including 1,1-disubstituted VBEs, from alkenes without significant hydrogenation or hydroboration, using the simple catalyst precursor, trans-[RhCl(CO)(PPh3)2] (1), and the diboron reagents B2pin2 (2a, pin = pinacolato = OCMe2CMe2O) or B2neop2 (2b, neop = neopentylglycolato = OCH2CMe2CH2O), or the monoboron
Regioselective Alkenylation of Aromatic Ketones with Alkenylboronates Using a RuH<sub>2</sub>(CO)(PPh<sub>3</sub>)<sub>3</sub> Catalyst via Carbon−Hydrogen Bond Cleavage
作者:Satoshi Ueno、Naoto Chatani、Fumitoshi Kakiuchi
DOI:10.1021/jo070182g
日期:2007.4.1
The ruthenium-catalyzed alkenylation of C−H bonds with alkenylboronates has been explored for a series of aromatic ketones. The coupling reaction of pivalophenone (1) with 2-isopropenyl-5,5-dimethyl[1,3,2]dioxaborinane (2) gave the corresponding isopropenylation product in 73% yield. In the case of the reaction of a sterically congested alkenylboronate, such as 2-methylpropenylboronate (8), the yield