Reaktion #1674612

Reaktionsgleichung

( 4 )

4'-[(5-butyl-3-cyclohexanoyl-1,2,4,-triazol-1-yl)methyl][1,1'-biphenyl]-2-carboxylic acid

( 8 )

N-trityl tetrazole

→

3,5-dibutyl-1H-1,2,4-triazole

Reaktionsbedingungen

Vorschrift

A solution of 64.5 g (0.50 mol) of ethyl iminovalerate [P. Reynaud and R. C. Moreau, Bull. Soc. Chim. France, 2997 (1964)] in 100 mL of methanol was added slowly to 58.0 g (0.50 mol) of valeric acid hydrazide (Lancaster Synthesis) in 400 mL of methanol at 0° C. under a nitrogen atmosphere. After the addition was complete, the reaction was allowed to warm to ambient temperature and then stir at reflux for 2 days. The solvent was removed in vacuo; purification by silica gel chromatography (Waters Prep-500A) using ethyl acetate/hexane (80:20) gave 78.9 g (93%) of a colorless solid: mp 50.5°-51.5° C.; NMR (CDCl3) δ0.88 (t, J=7 Hz, 6H), 1.28-1.33 (m, 4H), 1.63-1.77 (m, 4H), 2.72 (t, J=7 Hz, 4H); MS (FAB) m/e (rel intensity) 183 (12%), 182 (100), 181 (3), 180 (6), 152 (8), 139 (4); HRMS. Calcd for M+H: 182.1657. Found: 182.1661.

Quelle