An efficient access to a variety of trifluoromethyl-substituted cyclic α-amino acid derivatives based on ruthenium-catalyzed cyclotrimerization of appropriate 1,6- and 1,7-diynes with terminal and internal alkynes has been developed.
An efficient method for the preparation of functionalized α-trifluoromethyl-substituted azahistidine analogues has been developed. The method is based on the regioselective addition of allenylmagnesiumbromide to highly electrophilic imines of trifluoropyruvates and subsequent 1,3-dipolar Huisgen cycloaddition between α-propargyl-α-trifluoromethyl-α-amino esters and organic azides.
作者:Sergej N. Osipov、Natalia M. Kobel'kova、Alexey F. Kolomiets、Ksenia Pumpor、Beate Koksch、Klaus Burger
DOI:10.1055/s-2001-16054
日期:——
A preparative simple synthesis of α-fluoromethyl tryptophans is described. The new method is based on a non-catalytic imine ene reaction of highly electrophilic imines derived from methyl bromodifluoro- and trifluoropyruvate, and 1-sulfonyl-3-methylene indolines.