A two step route to indoles from haloarenes—a versatile variation on the Fischer indole synthesis
作者:Martyn Inman、Christopher J. Moody
DOI:10.1039/c0cc04306k
日期:——
In a new variation on the Fischer indole synthesis, readily available haloarenes are converted into a wide range of indoles in just two steps by halogen-magnesium exchange, quenching with di-tert-butyl azodicarboxylate, followed by reaction with ketones under acidic conditions.
Iridium- and ruthenium-catalysed synthesis of 2,3-disubstituted indoles from anilines and vicinal diols
作者:Matyas Tursky、Linda L. R. Lorentz-Petersen、Lasse B. Olsen、Robert Madsen
DOI:10.1039/c0ob00106f
日期:——
A straightforward and atom-economical method is described for the synthesis of 2,3-disubstituted indoles. Anilines and 1,2-diols are condensed under neat conditions with catalytic amounts of either [Cp*IrCl2]2/MsOH or RuCl3·xH2O/phosphine (phosphine = PPh3 or xantphos). The reaction does not require any stoichiometric additives and only produces water and dihydrogen as byproducts. Anilines containing
The development of a visible-light-mediated oxidativecleavage of electron-deficient indoles is reported. Methylene blue serves as an effective catalyst and the transformation shows a broad substrate scope. A variety of functional groups are well accommodated in the mild reaction conditions. The photo-mediated single electron transfer and oxidativecleavage mechanisms were investigated via density functional
Organocatalytic Enantioselective Functionalization of Unactivated Indole C(sp
<sup>3</sup>
)−H Bonds
作者:Dengke Ma、Zhihan Zhang、Min Chen、Zhenyang Lin、Jianwei Sun
DOI:10.1002/anie.201909397
日期:2019.10.28
Described here is a direct catalyticasymmetric functionalization of unactivated alkyl indoles using organocatalysis. In the presence of an effective chiral urea catalyst and a phosphoric acid additive, the intermolecular C-C bond formation between alkyl indoles and trifluoropyruvates proceeded with highefficiency and enantiocontrol. Unlike previous asymmetric C(sp3 -H) functionalizations of α-azaarenes
enantioselective C6 functionalization of 2,3-disubstitutedindoles with azadienes has been developed using chiral phosphoric acid as catalyst, providing a convenient approach to synthesize the optically active heterotriarylmethanes with excellent yields, broad substrate scope, and up to 98% ee. Mechanistic studies revealed that N-alkylation of 2,3-disubstitutedindoles with azadienes would be reversible