Ethanol → HCID 54343075, compound

Participants

Reaction Steps

To 100 ml of ethanol, there are added 3 g of L-alanyl-N-(indan-2-yl)glycine tert-butyl ester oxalate, 0.75 g of sodium acetate, 1.5 g of acetic acid, 5 g of molecular sieve 3A and 5 g of ethyl 4-(4-benzyloxyphenyl)-2-oxobutyrate, and catalytic reduction is carried out using Raney nickel as catalyst. When the hydrogen absorption has ceased, the catalyst is removed, and catalytic reduction is further carried out using palladium-carbon as catalyst. The catalysts is filtered off and the solvent is distilled off under reduced pressure to give N-[1-ethoxycarbonyl-3-(p-hydroxyphenyl)propyl]-L-alanyl-N-(indan-2-yl)glycine tert-butyl ester as oil. This oil is converted by the reaction procedure as used in Example 4 to N-[1-ethoxycarbonyl-3-(4-hydroxyphenyl)propyl]-L-alanyl-N-(indan-2-yl)glycine hydrobromide, which is further converted to the hydrochloride by the procedure of Example 6. There is thus obtained 0.65 g of N-[1-ethoxycarbonyl-3-(4-hydroxyphenyl)propyl]-L-alanyl-N-(indan-2-yl)glycine hydrochloride as colorless crystals melting at 126°-130° C. with decomposition.

Provenance & Evidence