A Brønsted Acid Catalyzed Cascade Reaction for the Conversion of Indoles to α‐(3‐Indolyl) Ketones by Using 2‐Benzyloxy Aldehydes
作者:Ankush Banerjee、Modhu Sudan Maji
DOI:10.1002/chem.201902268
日期:2019.9.2
A Brønstedacid catalyzed, operationally simple, scalable route to several functionalized α-(3-indolyl) ketones has been developed and the long-standing regioisomeric issue has been eliminated by choosing appropriate carbonyls. A readily available and cheap bottle reagent was used as the catalyst. This protocol was also applicable to the synthesis of densely functionalized α-(3-pyrrolyl) ketones. A
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.
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.
C3-Alkenylation between Pyrroles and Aldehydes Mediated by a Brønsted Acid and a Brønsted Base
作者:Samrat Sahu、Avijit Roy、Mahadeb Gorai、Sudip Guria、Modhu Sudan Maji
DOI:10.1002/ejoc.201901228
日期:2019.10.9
A redox‐neutral, organocatalytic C3‐alkenylation of pyrroles is reported. Readily available aldehydes act as alkenylating agent, and the reaction tolerates a variety of functional groups. The E‐alkenylated products were isolated in moderate to exclusive selectivity. A one‐pot two‐fold alkenylation strategy was also developed. Synthetically challenging indolylpyrrole derivatives were synthesized using