Potassium Sodium Tartrate → (S)-3-(hydroxymethyl)-7,8-dihydro-5H-azeto[1,2-a]pyrido[3,2-e]pyrazin-6(6aH)-one

(S)-methyl 6-oxo-6,6a,7,8-tetrahydro-5H-azeto[1,2-a]pyrido[3,2-e]pyrazine-3-carboxylate (0.570 g, 2.444 mmol) was suspended in Tetrahydrofuran (Volume: 8.15 ml) under nitrogen atmosphere and NaH (196 mg, 4.9 mmol) was added in several portions over 2 min. The reaction mixture was stirred at room temperature for 10 min and cooled to below −50° C. lithium aluminum hydride (2.200 ml, 4.40 mmol) was added over the period of 5 min and the reaction was kept at a temperature between −30 and −20° C. for 1 h (LCMS: >95% conversion). The mixture was cooled to below −50° C. and MeOH (4 mL) was added. Water (1 mL) was added and the reaction mixture was stirred at rt for 10 min. Rochelle salt (20% solution) was added (10 mL) and the mixture was extracted with EtOAc (3×30 mL) and THF (3×100 mL). The combined organic extracts were dried (Na2SO4 and MgSO4), filtered and concentrated in vacuo. The residue was suspended in THF/Ethyl ether (1:1, 20 mL), filtered off and dried in vacuum to afford (S)-3-(hydroxymethyl)-7,8-dihydro-5H-azeto[1,2-a]pyrido[3,2-e]pyrazin-6(6aH)-one (0.332 g, 1.618 mmol, 66.2% yield) as a light tan solid. [M+H] calc'd for C10H11N3O2, 205; found, 205.

1. additionwas added over the period of 5 min
2. waitthe reaction was kept at a temperature between −30 and −20° C. for 1 h
3. temperatureThe mixture was cooled to below −50° C.
4. stirringthe reaction mixture was stirred at rt for 10 min
5. extractionthe mixture was extracted with EtOAc (3×30 mL) and THF (3×100 mL)
6. dry with materialThe combined organic extracts were dried (Na2SO4 and MgSO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. filtrationfiltered off
10. customdried in vacuum

ORD record

ord-c7352d727e314fa386d1d8a02257346e

Source dataset

uspto-grants-2012_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08124606B2