Chloromethyl phenyl sulphide → 5-n-Butyl-2,4-dihydro-2-(phenylthiomethyl)-4-[[2'-(N-trityltetrazol-5-yl)biphenyl-4-yl]methyl]-3H-1,2,4-triazol-3-one

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The alkylation of 5-n-butyl-2,4-dihydro-4-[[2'-(N-trityltetrazol-5-yl)biphenyl-4-yl]methyl]-3H-1,2,4-triazol-3-one (from Example 2, Step D) with chloromethyl phenyl sulfide was carried out as described in Example 3, Step A, except that only 5 equivalents of the alkylating agent was used. After work-up, the residue was flash chromatographed over silica gel (25 mL for 0.162 mole, gradient elution using 0.25-1.0% MeOH/CH2Cl2) to give the desired material as a colorless oil in 17% yield, homogeneous by TLC in 2% MeOH/CH2Cl2, mass spectrum (FAB) m/e 740 (M+1)+.

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