Palladium-Catalyzed Asymmetric Allylic Alkylation of 3-Substituted 1<i>H</i>-Indoles and Tryptophan Derivatives with Vinylcyclopropanes
作者:Barry M. Trost、Wen-Ju Bai、Christoph Hohn、Yu Bai、James J. Cregg
DOI:10.1021/jacs.8b03656
日期:2018.5.30
this report, we reverse this reactivity and drive the 1,3-dipoles to serve as electrophiles by employing 3-alkylated indoles as nucleophiles. This represents the first use of VCPs for the completely atom-economic functionalization of 3-substituted 1 H-indoles and tryptophan derivatives via a Pd-catalyzed asymmetric allylic alkylation (Pd-AAA). Excellent yields and high chemo-, regio-, and enantioselectivities
Palladium-Catalyzed Enantioselective C-3 Allylation of 3-Substituted-1<i>H</i>-Indoles Using Trialkylboranes
作者:Barry M. Trost、Jean Quancard
DOI:10.1021/ja0608139
日期:2006.5.1
We have developed a new enantioselective C-3 allylation of 3-substituted indoles using allyl alcohol and trialkylboranes. Asymmetric syntheses of 3,3-disubstituted indolines and indolenines in enantiomeric excesses up to 90% have been achieved using the bulky borane 9-BBN-C6H13 as the promoter of the reaction. The dependence of the selectivity on the nature of the borane suggests that the boron reagent has a role beyond promoting ionization of the allyl alcohol. A protocol for oxidation of indolenines to oxindoles has also been developed and led to a formal synthesis of (-)-phenserine.
We describe the first example of manganese(III)-catalyzed aerobic dehydrogenative cyclization producing ring-fused indole skeletons. This catalytic system converts from two C–H bonds of indole and malonate to a C–C bond and produces water as the sole side product. This operationally easy method was extended to an intermolecular cross-dehydrogenative coupling of indole and α-substituted malonate with complete C2-selectivity.
We have achieved a rare‐metal‐free photo‐aerobic intramolecular dehydrogenative couplingreaction from two C—H bonds of indole with malonate. This catalytic system proceeded at room temperature under visible light irradiation with oxygen in the air as a terminal oxidant, and the cyclization products were obtained in good to excellent yields.