Rao, H Surya Prakash; Gorityala, Bala Kishan; Vasantham, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2007, vol. 46, # 9, p. 1470 - 1474
Synthesis of multi-substituted pyrroles using enamides and alkynes catalyzed by Pd(OAc)<sub>2</sub>with molecular oxygen as an oxidant
作者:Yun-He Xu、Tao He、Qiu-Chi Zhang、Teck-Peng Loh
DOI:10.1039/c3cc49683j
日期:——
A cyclization reaction between enamides and alkynes catalyzed by palladium(II) acetate is described. In this method, the molecular oxygen serves as an efficient oxidant for the Pd(II)/Pd(0) catalytic cycle. The simple reaction conditions permit this methodology to be used as a general tool for the preparation of multi-substituted pyrroles.
Rhodium-Catalyzed Oxidative Cycloaddition of <i>N</i>
-<i>tert</i>
-Butoxycarbonylhydrazones with Alkynes for the Synthesis of Functionalized Pyrroles <i>via</i>
C(<i>sp</i>
<sup>3</sup>
)-H Bond Functionalization
作者:Chun-Ming Chan、Zhongyuan Zhou、Wing-Yiu Yu
DOI:10.1002/adsc.201600900
日期:2016.12.22
The reaction features a regioselective α‐imino alkyl C(sp3)−H bond functionalization resulting in selective formation of highlyfunctionalized NH‐free pyrroles. Our studies showed that utilizing the N‐tert‐butoxycarbonyl (N‐Boc) as the oxidizing directing group is critical for achieving the observed pyrrole formation versus the isoquinoline formation. To account for the pyrrole formation, we hypothesized
A novel and efficient Fe-catalyzed radical cycloaddition of 2H-azirines and enamides for the synthesis of substituted pyrroles has been developed. The radical cycloaddition reaction proceeded through a conceptually new Fe(II)-catalyzed homolytic cleavage of C–N bond of 2H-azirines sequential radical cyclization with enamides. The reaction used readily available starting materials, tolerated various
A novel copper-catalyzed C(sp3)–H functionalization of ketones with vinyl azides for the synthesis of substituted pyrroles has been developed.
一种新颖的铜催化的C(sp3)-H键功能化反应,使用乙烯叠氮化物与酮反应合成取代吡咯化合物。
“One pot” regiospecific synthesis of polysubstituted pyrroles from benzylamines and ynones under metal free conditions
作者:Jinhai Shen、Guolin Cheng、Xiuling Cui
DOI:10.1039/c3cc43844a
日期:——
A convenient âone-potâ weak base-promoted synthesis of polysubstituted pyrroles has been developed from benzylamines and ynones. This transformation involves the Michael addition reaction and intramolecular condensation, which features high regioselectivity, high efficiency, environmental friendliness and metal free. A series of polysubstituted pyrroles were provided in up to 91% yield for 27 examples.