反应详情

By using an analogous procedure to that described for Example 1, a solution of benzyl (1S)-1-benzyl-2-oxo-2-[(3-oxopropyl)amino]ethylcarbamate (61 mg, 0.173 mmol, obtained from Reference Example 22), 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), acetic acid (1 drop), and sodium triacetoxyborohydride (59 mg, 0.277 mmol) in anhydrous tetrahydrofuran (4 ml) was stirred at room temperature under nitrogen for 5 hours. The product was purified by chromatography (flash column, silica gel, 2.5% methanol in methylene chloride) to provide tert-butyl (5S,12S)-5-benzyl-12-[(R)-[(3R,4R,5R)-3,4-bis{[tertbutyl(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 (31 mg, 21%) as a white solid.

1. customThe product was purified by chromatography (flash column, silica gel, 2.5% methanol in methylene chloride)