反应详情

By using an analogous procedure to that described for 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 (125 mg, 0.173 mmol, obtained from Reference Example 6), 9H-fluoren-9-ylmethyl-11-oxo-11-[(3-oxopropyl)amino]undecyl-carbamate (99 mg, 0.208 mmol, obtained from Reference Example 30), acetic acid (2 drops) and sodium triacetoxyborohydride (73 mg, 0.346 mmol) in anhydrous tetrahydrofuran (4 ml) was stirred at room temperature under nitrogen for 5.5 hours. The product was purified by chromatography (flash column, silica gel, ethyl acetate) to provide tert-butyl (21S)-21-[(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]-1-(9H-fluoren-9-yl)-3,15-dioxo-2-oxa-4,16,20-triazadocosan-22-oate (133 mg, 65%) as a white solid.

1. customThe product was purified by chromatography (flash column, silica gel, ethyl acetate)