Synthesis of α-(3-Indolyl)glycine Derivatives via Spontaneous Friedel-Crafts Reaction between Indoles and Glyoxylate Imines
作者:Biao Jiang、Zuo-Gang Huang
DOI:10.1055/s-2005-869978
日期:——
Mannich-type Friedel-Crafts reaction between indoles and ethyl glyoxylate imines proceeded spontaneously in the absence of an acid catalyst. Ethyl alpha-(3-indolyl)glycinates were obtained in moderate to high yields. Reaction with (R)-alpha-methylbenzylamine derived imine afforded chiral alpha-(3-indolyl)glycinates with good diastereoselectivities (up to 96:4).
Visible Light Catalysis Assisted Site-Specific Functionalization of Amino Acid Derivatives by C–H Bond Activation without Oxidant: Cross-Coupling Hydrogen Evolution Reaction
hydrogen (H2) in good to excellent yields under visiblelight irradiation. A mechanistic study reveals that the cascade electron transfer processes from glycine ester to the photoexcited Ru(bpy)3(PF6)2 and then to Co(dmgH)2pyCl catalyst, together with the capture of protons delivered by substrates, are crucial for the cross-coupling hydrogen evolution reaction of secondary amines in organic solvents.