(R)-3-(tert-butoxycarbonylamino)-4-(2,4,5-trifluorophenyl)butanoic acid → 7-[(3R)-3-[(tert-Butoxycarbonyl)amino]-4-(2,4,5-trifluorophenyl)butanoyl]-8-[2-(dimethylamino)-2-oxoethyl]-2-(trifluoromethyl)-5,6,7,8-tetrahydro[1,2,4]triazolo[1,5-alpha]pyrazine

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Reaction Steps

A 200 mg portion of 8-[2-(dimethylamino)-2-oxoethyl]-2-(trifluoromethyl)-5,6,7,8-tetrahydro[1,2,4]triazolo[1,5-α]pyrazine, hydrochloride was coupled to (3R)-3-[(tert-butoxycarbonyl)amino]-4-(2,4,5-trifluorophenyl)butanoic acid essentially following the procedure outlined in Example 2, Step D. Purification by preparative TLC (silica gel, 10% methanol/dichloromethane) followed by HPLC (AD chiral pak column, 15% isopropanol/heptane) separated the first and last eluting diastereomers. LC/MS 593 (M+1).

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