反应详情

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 phenacyl bromide was carried out as described in Example 3, Step A, except that only 3 equivalents of the alkylating agent was used. After work-up, the residue was flash chromatographed over silica gel (25 mL for 0.162 mmole, gradient elution using 0.5-2.0% MeOH/CH2Cl2) to give the desired compound as a white foam in 81% yield, homogeneous by TLC in 2% MeOH/CH2Cl2, mass spectrum (FAB) 736 (M+1)+.

1. customchromatographed over silica gel (25 mL for 0.162 mmole, gradient elution using 0.5-2.0% MeOH/CH2Cl2)