반응 #54014

반응 방정식

tert-butyl (5S,12S)-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]-5-[(1S)-1-hydroxyethyl]-3,6-dioxo-1-phenyl-2-oxa-4,7,11-triazatridecan-13-oate

Tetrabutylammonium fluoride

→

tert-butyl (5S,12S)-12-[(R)-[(3S,4R,5R)-3,4-dihydroxy-5-(3-(4-methoxybenzyl)-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl)tetrahydro-2-furanyl]-(hydroxy)methyl]-5-[(1S)-1-hydroxyethyl]-3,6-dioxo-1-phenyl-2-oxa-4,7,11-triazatridecan-13-oate

수율 25.0%

용매

ethyl acetate

tetrahydrofuran

반응 조건

후처리

1. 1
   세척washed with saturated sodium chloride
2. 2
   건조dried over sodium sulfate
3. 3
   여과filtered
4. 4
   농축concentrated in vacuo
5. 5
   기타The residue was chromatographed (flash column, silica gel, 5% methanol in methylene chloride)

실험 절차

A solution of tert-butyl (5S,12S)-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]-5-[(1S)-1-hydroxyethyl]-3,6-dioxo-1-phenyl-2-oxa-4,7,11-triazatridecan-13-oate (63 mg, 0.062 mmol, obtained from Example 10) in anhydrous tetrahydrofuran (1 ml) was cooled at 0° C. under nitrogen. Tetrabutylammonium fluoride (0.186 mL, 0.186 mmol; 1 M solution in tetrahydrofuran, Aldrich) was added and the resulting mixture was warmed to room temperature and stirred for 2.75 hours. The reaction mixture was diluted with ethyl acetate, washed with saturated sodium chloride, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was chromatographed (flash column, silica gel, 5% methanol in methylene chloride) to provide tert-butyl (5S,12S)-12-[(R)-[(3S,4R,5R)-3,4-dihydroxy-5-(3-(4-methoxybenzyl)-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl)tetrahydro-2-furanyl]-(hydroxy)methyl]-5-[(1S)-1-hydroxyethyl]-3,6-dioxo-1-phenyl-2-oxa-4,7,11-triazatridecan-13-oate (12 mg, 25%) as a light yellow solid.

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