反应详情

By using an analogous procedure to that described in Example 1, a solution of tert-butyl (2S,3R)-2-amino-3-[(2R,3R,4R,5R)-3,4-bis{[tert-butyl-(dimethyl)silyl]oxy}-5-(3-(4-methoxybenzyl)-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl)-tetrahydro-2-furanyl]-3-hydroxypropanoate (100 mg, 0.139 mmol, obtained from Reference Example 6), benzyl (3S)-3-{[(benzyloxy)carbonyl]amino}-4-oxo-4-[(3-oxopropyl)amino]butanoate (71 mg, 0.173 mmol, obtained from Reference example 24), acetic acid (1 drop), and sodium triacetoxyborohydride (59 mg, 0.277 mmol) in anhydrous tetrahydrofuran (4 ml) was stirred under nitrogen at room temperature for 5 hours. The product was purified by chromatography (flash column, silica gel, 5% methanol in methylene chloride) to provide tert-butyl (5S,12S)-5-[2-(benzyloxy)-2-oxoethyl]-12-[(R)-[(3R,4R,5R)-3,4-bis{[tert-butyl(dimethyl)silyl]oxy}-5-(3-(4-methoxybenzyl)-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl)tetrahydro-2-furanyl](hydroxy)methyl]-3,6-dioxo-1-phenyl-2-oxa-4,7,11-triazatridecan-13-oate (109 mg, 70%) as a white amorphous solid.

1. customThe product was purified by chromatography (flash column, silica gel, 5% methanol in methylene chloride)