Imidazole → (2R,3S,4R,5R)-2,3,4,5,6-pentahydroxyhexanal

To a solution of the crude acetyl glucal 3 (12.5 g, 45.9 mmol) in dry MeOH (150 mL) was added a solution of sodium methoxide (NaOMe, 4.59 mmol) in dry MeOH (1 mL) at room temperature. The reaction mixture was stirred for 30 min and evaporated to dryness. The residue was dissolved in dry N,N-dimethylformamide (DMF, 150 mL) at 0° C. and to this solution was added imidazole (9.4 g, 137.7 mmol) and tert-butyldimethylsilyl chloride (10.4 g, 68.9 mmol). The reaction mixture was stirred for 3 h at room temperature, diluted with icewater, and extracted with 50% ethyl acetate (AcOEt)-hexane. The organic extract was washed with brine, dried over MgSO4, and evaporated in vacuo. The residue was purified by chromatography on silica gel (200 g) using 50% AcOEt-hexane to yield 4 (7.15 g, 65% from D-glucose).

1. customevaporated to dryness
2. dissolutionThe residue was dissolved in dry N,N-dimethylformamide (DMF, 150 mL) at 0° C. and to this solution
3. stirringThe reaction mixture was stirred for 3 h at room temperature
4. additiondiluted with icewater
5. extractionextracted with 50% ethyl acetate (AcOEt)-hexane
6. extractionThe organic extract
7. washwas washed with brine
8. dry with materialdried over MgSO4
9. customevaporated in vacuo
10. customThe residue was purified by chromatography on silica gel (200 g)

ORD record

ord-b668f653c5b449208bd440cb4185e72d

Source dataset

uspto-grants-2005_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06844461B2