Synthesis of 3-(d-lyxofuranosyl)pyrazoles by trifluoroacetic acid-catalysed cyclodehydration of 3-(d-galacto-pentitol-1-yl)pyrazoles
作者:Manuel Gómez-Guillén、José María Lassaletta Simon
DOI:10.1016/0008-6215(91)80098-8
日期:1991.4
Abstract New 3-( d - galacto -pentitol-1-yl)pyrazole derivatives have been obtained by the reaction of d -galactose hydrazones and nitroalkenes. Cyclodehydration of the 1-methyl-3-( d - galacto -pentitol-1-yl)pyrazoles in trifluoroacetic acid at room temperature afforded good yields of 3-(α- d -lyxofuranosyl)-1-methyl derivatives. A β anomer was obtained only for the 5-( p -tolyl) derivative.