Preparation of Potassium Azidoaryltrifluoroborates and Their Cross-Coupling with Aryl Halides
摘要:
Potassium azidoaryltrifluoroborates have been prepared from the corresponding haloaryltrifluoroborates in 73-98% yields. Also, we successfully cross-coupled the azido-functionalized organotrifluoroborates and carried out a one-pot sequential cross-coupling/1,3-dipolar cycloaddition and a one-pot cross-coupling/azide reduction process.
Pd(ii)-catalyzed decarboxylative cross-coupling of oxamic acids with potassium phenyltrifluoroborates under mild conditions
作者:Mingzong Li、Cong Wang、Ping Fang、Haibo Ge
DOI:10.1039/c1cc11635e
日期:——
A novel Pd-catalyzed decarboxylative cross-coupling of oxamic acids with potassium phenyltrifluoroborates has been realized under mild reaction conditions. This method provides an efficient access to N-mono- or N,N-disubstituted benzamides and benzoates.
For the first time the room-temperature rhodium-catalyzedasymmetric1,4-addition of potassium aryltrifluoroborates to α,β-unsaturated substrates is described. Thanks to the use of a chiral diene as ligand for rhodium and triethylamine as base, to facilitate transmetalation of the boron species, high yields and enantioselectivities were generally achieved. Moreover, the use of such tetravalent boron
Preparation of Potassium Alkynylaryltrifluoroborates from Haloaryltrifluoroborates via Sonogashira Coupling Reaction
作者:Dong-Su Kim、Jungyeob Ham
DOI:10.1021/ol100081v
日期:2010.3.5
A novel series of alkyne-containing potassium organotrifluoroborates were prepared in good yields from the corresponding haloaryltrifluoroborates and various alkynes via Sonogashira coupling reaction. Also, the Suzuki−Miyauracross-coupling reaction of alkynylaryltrifluoroborates with aryl and alkenyl bromides was achieved in the presence of 5 mol % of Pd(TPP)4 and 3.0 equiv of Cs2CO3 in aqueous 1
通过Sonogashira偶联反应,由相应的卤代芳基三氟硼酸酯和各种炔烃以高收率制备了一系列新的含炔烃的有机三氟硼酸钾。同样,在150° C的1,4-二恶烷水溶液中存在5 mol%的Pd(TPP)4和3.0当量的Cs 2 CO 3存在下,实现了炔基芳基三氟硼酸酯与芳基和烯基溴化物的Suzuki-Miyaura交叉偶联反应。C通过微波辐照。
Synthesis of Dialkyl Ethers from Organotrifluoroborates and Acetals
作者:T. Andrew Mitchell、Jeffrey W. Bode
DOI:10.1021/ja906514s
日期:2009.12.23
The formation of ethers by C-O bond formation under harsh basic or acidic conditions is an entrenched synthetic disconnection in organic chemistry. We report a strategic alternative that involves the BF(3).OEt(2)-promoted coupling of stable, easily prepared acetals with widely available potassium aryl-, alkenyl-, and alkynyltrifluoroborates. This fast, operationally simple process offers straightforward
在苛刻的碱性或酸性条件下通过 CO 键形成形成醚是有机化学中根深蒂固的合成断开。我们报告了一种战略替代方案,涉及 BF(3).OEt(2) 促进的稳定、易于制备的缩醛与广泛可用的芳基-、烯基-和炔基三氟硼酸钾的偶联。这种快速、操作简单的过程提供了直接获得二烷基醚的途径,其中许多使用经典方法难以制备。使用 MOM 保护的醇和缩醛保护的醛可以形成醚,而无需求助于保护基操作或强碱。
Direct Access to Ketones from Aldehydes via Rhodium-Catalyzed Cross-Coupling Reaction with Potassium Trifluoro(organo)borates
A direct cross-coupling reaction of aromatic aldehydes with potassiumtrifluoro(organo)borates afforded ketones in high yields and under mild conditions in the presence of a rhodium catalyst and acetone. This new reaction, involving a formal aldehyde C-H bond activation, is believed to proceed via a Heck-type mechanism followed by hydride transfer to acetone.