Process for the preparation of certain triaryl rhamnose carbamates

A process for preparing a substituted triazole of formula (IIa)

• wherein
• Z represents a furanyl, phenyl, pyridazinyl, pyridyl, pyrimidinyl or thienyl group, unsubstituted or substituted with one or more substituents independently selected from F, Cl, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 haloalkoxy or C1-C6 haloalkylthio,
• which comprises contacting 3-bromo-1H-1,2,4-triazole
• with a brominated or iodinated furanyl, phenyl, pyridazinyl, pyridyl, pyrimidinyl or thienyl compound, unsubstituted or substituted with one or more substituents independently selected from F, Cl, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 haloalkoxy or C1-C6 haloalkylthio of one of the following formulas
• wherein
• L represents Br or I,
• X independently represents F, Cl, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 haloalkoxy or C1-C6 haloalkylthio,
• m=0, 1, 2 or 3,
• n=0, 1, 2, 3 or 4, and
• p=0, 1, 2, 3, 4 or 5,
• in a polar aprotic solvent in the presence of a catalytic amount of copper catalyst and at least one equivalent of an inorganic base at a temperature from ambient to about 120° C.