Rhodium(II)-Catalyzed Enantioselective C−H Functionalization of Indoles
摘要:
A catalytic, enantioselective method for the C-H functionalization of indoles by diazo compounds has been achieved. With catalytic amounts of Rh-2(S-NTTL)(4), the putative Rh-carbene intermediates from alpha-alkyl-alpha-diazoesters react with indoles at C(3) to provide alpha-alkyl-alpha-indolylacetates in high yield and enantioselectivity. From DFT calculations, a mechanism is proposed that involves a Rh-ylide intermediate with oxocarbenium character.
Indium controlled regioselective 1,4-alkylarylation of 1,3-dienes with α-carbonyl alkyl bromides and N-heterocycles
作者:Chang-Cheng Gu、Xuan-Hui Ouyang、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/c9cc08903a
日期:——
We here describe a new, selective indium-promoted silver-mediated intermolecular oxidative 1,4-alkylarylation of 1,3-dienes with α-carbonyl alkyl bromides and N-heterocycles for producing functionalized N-heterocycles, which is characterized by its exquisitely controllable regio-/stereo-selectivity and excellent tolerance of functional groups. Mechanistically, the formation of the carbonyl-coordinated
HFIP-mediated C-3-alkylation of indoles and synthesis of indolo[2,3-b]quinolines & related natural products
作者:Auqib Rashid、Waseem I. Lone、Preeti Dogra、Showkat Rashid、Bilal A. Bhat
DOI:10.1039/d4ob00414k
日期:——
An expeditious metal free C-3 alkylation of indoles and its NIS-mediated deviation to indolo[2,3-b]quinolines is reported. This protocol, executed in aqueous HFIP has broad substrate scope and is well inclined towards the ideas of sustainable chemistry. Applications of these strategies in accessing bioactive natural products like vibrindole, norcryptotakeine, neocryptolepine and indenoindolone scaffolds