4-(Chloromethyl)-1-trityl-1H-imidazole → 2-(Benzylidene-amino)-3-(1-trityl-1H-imidazol-4-yl)-2-(1-trityl-1H-imidazol-4-ylmethyl)-propionic acid methyl ester

Participants

Reaction Steps

A solution of potassium bis(trimethylsilyl)amide (11.34 g, 54 mmol) in THF (100 ml) was added dropwise to a mixture of (benzylidene-amino)-acetic acid methyl ester (3.83 g, 21.63 mmol) and 4-chloromethyl-1-trityl-1H-imidazole (21.6 g, 60.18 mmol) in THF (200 ml) at −78° C. The resultant solution was warmed to ambient temperature and stirred for 24 hours. After removal of THF, the reaction mixture was subsequently partitioned between ethyl acetate and brine. The aqueous layer was washed two times with ethyl acetate. The ethyl acetate extracts were combined, dried over MgSO4, filtered and concentrated to give the crude title compound of 53A.

Provenance & Evidence