Lithium tri-tert-butoxyaluminohydride → 1-[(2S,4S,5R)-5-(5-amino-2,7-dioxo-6H-thiazolo[4,5-d]pyrimidin-3-yl)-4-hydroxy-tetrahydrofuran-2-yl]propyl acetate

HRID 60716Notes

Reaction equation

HRID 60716 reaction equation
[C:1]([O:4][CH:5]([C@@H:8]1[CH2:12][C:11](=[O:13])[C@H:10]([N:14]2[C:18]3[N:19]=[C:20]([NH2:24])[NH:21][C:22](=[O:23])[C:17]=3[S:16][C:15]2=[O:25])[O:9]1)[CH2:6][CH3:7])(=[O:3])[CH3:2].[H-].C(O[Al](OC(C)(C)C)OC(C)(C)C)(C)(C)C.[Li+]>C1COCC1>[C:1]([O:4][CH:5]([C@@H:8]1[CH2:12][C@H:11]([OH:13])[C@H:10]([N:14]2[C:18]3[N:19]=[C:20]([NH2:24])[NH:21][C:22](=[O:23])[C:17]=3[S:16][C:15]2=[O:25])[O:9]1)[CH2:6][CH3:7])(=[O:3])[CH3:2]

Participants

4

Reactant 2

HCID 16710494Lithium tri-tert-butoxyaluminohydrideHCID 1371087081-[(2S,5R)-5-(5-amino-2,7-dioxo-6H-thiazolo[4,5-d]pyrimidin-3-yl)-4-oxo-tetrahydrofuran-2-yl]propyl acetate2×

Product 1

HCID 1371087351-[(2S,4S,5R)-5-(5-amino-2,7-dioxo-6H-thiazolo[4,5-d]pyrimidin-3-yl)-4-hydroxy-tetrahydrofuran-2-yl]propyl acetateYield 62.5%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a stirred solution of 1-[(2S,5R)-5-(5-amino-2,7-dioxo-6H-thiazolo[4,5-d]pyrimidin-3-yl)-4-oxo-tetrahydrofuran-2-yl]propyl acetate (compound 22b, 2.8 g, 7.6 mmol) in THF (50 mL) was added lithium tri-tert-butoxyaluminum hydride (1M in THF, 15 mL, 15 mmol). After being stirred at room temperature for 2 hours, the resulting solution was quenched by saturated NH4Cl solution and filtered. The filtrate was concentrated in vacuo and the residue was purified by column chromatography on silica gel (eluting with 1:10 methanol in DCM) to afford 1.76 g crude product of 1-[(2S,4S,5R)-5-(5-amino-2,7-dioxo-6H-thiazolo[4,5-d]pyrimidin-3-yl)-4-hydroxy-tetrahydrofuran-2-yl]propyl acetate (compound 22c). MS obsd. (ESI−) [(M−H)+]: 369. (Refer to Tetrahedron 1984, 40, 125-135).

Workup

  1. customthe resulting solution was quenched by saturated NH4Cl solution
  2. filtrationfiltered
  3. concentrationThe filtrate was concentrated in vacuo
  4. customthe residue was purified by column chromatography on silica gel (eluting with 1:10 methanol in DCM)

Sources & evidence

ORD record
ord-d3ab1020fdd64085afff1a70227ea477
Source dataset
uspto-grants-2016_09
Patent number
US09441008B2

Reaction notes

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