Sodium hydride → (S)-3-(hydroxymethyl)-6a,7,8,9-tetrahydropyrido[3,2-e]pyrrolo[1,2-a]pyrazin-6(5H)-one

(S)-methyl 6-oxo-5,6,6a,7,8,9-hexahydropyrido[3,2-e]pyrrolo[1,2-a]pyrazine-3-carboxylate (3.00 g, 10.5 mmol) was suspended in THF and sodium hydride (60% suspension in mineral oil, 0.712 g, 17.8 mmol) was added under nitrogen atmosphere. The reaction mixture was stirred at room temperature for 1 h and cooled to −78° C. LiAlH4 (2M in THF, 12.5 mL, 25 mmol) was added dropwise over 5 min and the reaction mixture was allowed to warm to −40° C. and kept at −40-(−20)° C. for 3 h. The reaction mixture was cooled to −60° C. and quenched with MeOH, water and TFA until a clear mixture resulted. This was purified using HPLC (1-30% acetnitrile in water, TFA buffered). The fractions containing product were concentrated in vacuo and crystallized with ethyl ether. The solid was filtered and dried in vacuum to afford the title compound as a grey solid (2.60 g, 74%, TFA salt). [M+H] calc'd for C11H13N3O2, 220; found, 220.

1. temperaturecooled to −78° C
2. temperatureto warm to −40° C.
3. waitfor 3 h
4. temperatureThe reaction mixture was cooled to −60° C.
5. customquenched with MeOH, water and TFA until a clear mixture
6. customresulted
7. customThis was purified
8. additionThe fractions containing product
9. concentrationwere concentrated in vacuo
10. customcrystallized with ethyl ether
11. filtrationThe solid was filtered
12. customdried in vacuum

ORD-Eintrag

ord-4c68f1c61db04e7994eed251be11ca2d

Quelldatensatz

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08822470B2