One-Pot Synthesis of Substituted Benzo[<i>b</i>]furans and Indoles from Dichlorophenols/Dichloroanilines Using a Palladium–Dihydroxyterphenylphosphine Catalyst
Sonogashira coupling of dichlorophenols and terminal alkynes, followed by cyclization and Suzuki–Miyauracoupling in one pot, using a palladium–dihydroxyterphenylphosphine (Cy-DHTP) catalyst. The use of substoichiometric amounts of tetrabutylammonium chloride was effective in accelerating the Suzuki–Miyauracoupling. This protocol was also successfully applied to the one-pot synthesis of disubstituted
二取代的苯并[ b ]呋喃是通过二氯苯酚和末端炔的邻位选择性Sonogashira偶联反应,然后使用钯-二羟基叔苯基膦(Cy-DHTP)催化剂在一个罐中进行环化和Suzuki-Miyaura偶联反应而合成的。亚化学计量的四丁基氯化铵的使用有效地加速了Suzuki-Miyaura偶联。该方案也成功地用于从二氯苯胺衍生物的一锅法合成二取代的吲哚。
Regioselective Synthesis of 4- and 7-Alkoxyindoles from 2,3-Dihalophenols: Application to the Preparation of Indole Inhibitors of Phospholipase A<sub>2</sub>
作者:Roberto Sanz、M. Pilar Castroviejo、Verónica Guilarte、Antonio Pérez、Francisco J. Fañanás
DOI:10.1021/jo070643y
日期:2007.7.1
An efficient and regioselectivesynthesis of 4- and 7-alkoxyindoles has been developed from commercially available starting materials such as 3-halophenols and 3-chloroanisole. Directed ortho-metalation followed by two palladium-catalyzed processes, a Sonogashira coupling and a tandem amination/cyclization reaction, allows the synthesis of regiochemically pure 4- and 7-substituted indoles. This strategy
A straightforward and transition metal-free one-pot protocol to synthesize halobenzo[b]furans has been developed employing simple and easily available starting materials such as O-aryl carbamates and alkynylsulfones. The fine-tuning of the different steps involved was key to achieving a successful one-pot procedure. Initially, a directed ortho-lithiation process, which uses the carbamate as the directed
One-Pot Synthesis of Substituted Benzo[<i>b</i>]furans from Mono- and Dichlorophenols Using Palladium Catalysts Bearing Dihydroxyterphenylphosphine
作者:Miyuki Yamaguchi、Haruka Katsumata、Kei Manabe
DOI:10.1021/jo401503t
日期:2013.9.20
on the phosphorus atom (Cy-DHTP) was found to be a powerful ligand for the palladium-catalyzed one-potsynthesis of substituted benzo[b]furans from 2-chlorophenols and terminal alkynes. This catalyst system was also applicable to the sequential one-potsynthesis of disubstituted benzo[b]furans from dichlorophenols via the Suzuki–Miyaura cross-coupling of chlorobenzo[b]furan with boronic acids. The use
发现在磷原子上带有环己基的二羟基叔苯基膦(Cy-DHTP)是钯催化由一锅法从2-氯酚和末端炔烃合成取代苯并[ b ]呋喃的强配体。该催化剂体系还适用于通过氯苯并[ b ]呋喃与硼酸的Suzuki-Miyaura交叉偶联从二氯苯酚一步法一锅合成二取代的苯并[ b ]呋喃。Cy-DHTP和XPhos这两种配体的使用是促进反应的关键。机理研究表明,Pd–Cy-DHTP催化剂是Sonogashira交叉偶联步骤中的活性物种,而Pd–XPhos催化剂则加速了Suzuki–Miyaura交叉偶联步骤。
ROCHE, M.;CERUTTI, E., ANN. SCI. UNIV. BESANCON. CHEM., 1981, N 2, 16 P.