Asymmetric Friedel–Crafts Alkylations of Indoles with Ethyl Glyoxylate Catalyzed by (S)-BINOL-Titanium(IV) Complex: Direct Access to Enantiomerically Enriched 3-Indolyl(hydroxy)acetates
EnantioselectiveFriedel–Craftsalkylation reactions of a variety of indoles with ethyl glyoxylate, catalyzed by a chiral (S)-BINOL-Ti(IV) complex (10 mol %), are reported. The corresponding ethyl 3-indolyl(hydroxy)acetates were formed in good yields and with high enantiomeric excess (up to 96 %). When methyl pyruvate or p-chlorophenylglyoxal was used, the bisindole compound was obtained in excellent
Cu(I)-Catalyzed Enantioselective Friedel–Crafts Alkylation of Indoles with 2-Aryl-<i>N</i>-sulfonylaziridines as Alkylating Agents
作者:Chen Ge、Ren-Rong Liu、Jian-Rong Gao、Yi-Xia Jia
DOI:10.1021/acs.orglett.6b01317
日期:2016.7.1
A highlyenantioselectiveFriedel–Craftsalkylation of indoles with N-sulfonylaziridines as alkylating agents has been developed by utilizing the complex of Cu(CH3CN)4BF4/(S)-Segphos as a catalyst. A range of optically active tryptamine derivatives are obtained in good to excellent yields and enantioselectivities (up to >99% ee) via a kinetic resolution process.
Ruthenium-Catalyzed Sequential Hydrosilylation/Dehydrogenation and C–H Silylation: Synthesis of Six-Membered Indole Silacycles and Pyrrole Silyl Ether Cycles
作者:Jiefang Li、Shanshan Xu、Jieyu Liang、Juanjuan Zheng、Ping Li、Jun Wang、Bin Li
DOI:10.1021/acs.orglett.4c01949
日期:2024.7.26
Selective dehydrogenative C–H silylation is one of the most powerful tools to synthesize silacycles. Herein, we developed Ru-catalyzed sequential hydrosilylation/C–H silylation of allyl-indoles and dehydrogenative O–H/C–H silylation of pyrrole phenols. Both six-membered indole silacycles and pyrrole silyl ether cycles were successfully synthesized with good functional group tolerance. Furthermore,