Citric Acid → pentyl[2'-(1-trityl-1H-tetrazol-5-yl)biphenyl-4-ylmethyl]amine

Participants

Reaction Steps

A mixture of 10.0 g (16.5 mmole) of 5-[4'-(bromomethyl)biphenyl-2-yl]-N-trityltetrazole [P. E. Aldrich, M. E. Pierce, and J. J. V. Duncia, European Patent Application 291,969 (1988)], 9.5 mL (7.14 g, 8.2 mmole) of n-pentylamine, 2.8 mL (2.03 g, 20 mmole) of triethylamine, and 100 mL of dry methylene chloride was stirred under N2 at room temperature overnight. Next, the mixture was shaken with 100 mL of 0.25M citric acid (aqueous). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. The viscous oil was flash chromatographed on silica gel (elution initially with 1:1 hexane-EtOAc and then with a larger volume of EtOAc alone) to yield 4.57 g (49%) of the title compound as a very viscous oil, homogeneous by TLC (EtOAc); FAB-MS m/e 563 (M+1)+.

Provenance & Evidence