A versatile, traceless C–H activation-based approach for the synthesis of diversified heterocycles is reported. Rh(III)-catalyzed, N-amino-directed C–H alkenylation generates either olefination products or indoles (in situ annulation) in an atom- and step-economic manner at room temperature. The remarkable reactivity endowed by this directing group enables scale-up of the reaction to a 10 g scale at
Fast, efficient Ru(iv)-catalysed regioselective allylation of indoles using allyl alcohol (without additives) under mild conditions
作者:Alexey B. Zaitsev、Stefan Gruber、Paul S. Pregosin
DOI:10.1039/b710763c
日期:——
The new Ru(IV) salt, [Ru(eta(3)-C(3)H(5))(Cp*)(CH(3)CN)(2)](PF(6))(2), is an excellent catalyst for the regioselective allylation of a variety of indole compounds usingallylalcohol as substrate; there are no co-catalysts required in this chemistry and the yields and reaction conditions are very favorable.
Co(III)-catalyzed, internal and terminal alkyne-compatible indole synthesis protocol is reported herein. The N-amino (hydrazine) group imparts distinct, diverse reactivity patterns for directed C–H functionalization/cyclization reactions. Notable synthetic features include regioselectivity for a meta-substituted arylhydrazine, regioselectivity for a chain-branched terminalalkyne, formal incorporation of
Novel Synthesis of 2-Aryl and 2,3-Disubstituted Indoles by Modified Double Elimination Protocol
作者:Govindarajulu Babu、Akihiro Orita、Junzo Otera
DOI:10.1021/ol051826e
日期:2005.10.1
[reaction: see text] Syntheses of 2-aryl and 2,3-substituted indoles were realized by modified doubleelimination protocol. Under basic conditions, vinyl sulfones derived from the reaction of 2-aminobenzyl sulfone with benzaldehydes underwent cyclization and alkylation followed by elimination of sulfinic acid to afford 2,3-substituted indoles.
Rhodium(III) Iodide Catalyzed Carboamination of Alkynes through C–N Bond Activation
作者:Tao Xu、XinXin Li、Qingxing Yang、Yuna Zhang
DOI:10.1055/a-2012-4835
日期:2023.3
polysubstituted indoles. The protocol features a broad substrate scope (>20 examples), good functional-group compatibility, and a low catalyst loading (5 mol% Rh). Good to excellent yields (up to 98%) were obtained. An unprecedented C–N bond-cleavage mode via a six-membered transition state σ-bond metathesis mechanism was proposed based on control experiments. A series of C3-allylated indole derivatives