تفاعل #71352

معادلة التفاعل

hydride

5-nitro-pyridine-2-carboxylic acid ethyl ester

→

title compound

المردود 49.8%

5-Nitro-pyridine-2-carbaldehyde

المردود 49.8%

المذيبات

DCM

ظروف التفاعل

المعالجة

1. 1
   أخرىquenched by addition of an aqueous solution of potassium sodium tartrate
2. 2
   workup.ADDITIONdiluted with DCM and H2O
3. 3
   ترشيحfiltered through a pad of celite
4. 4
   استخلاصThe filtrate was extracted several times with DCM
5. 5
   غسيلThe organic phase was washed with H2O and brine
6. 6
   تجفيفdried (Na2SO4)
7. 7
   ترشيحfiltered
8. 8
   تركيزconcentrated
9. 9
   أخرىThe residue was purified by by silica gel column chromatography (EtOAc/Hex, 1:1)

الإجراء التجريبي

Diisobutylaluminiumo hydride (1 M in DCM, 44 mL, 44 mmol, 1.3 equiv) was added dropwise to a cold (−78° C.) solution of 5-nitro-pyridine-2-carboxylic acid ethyl ester (step 39.4) (6.56 g, 33.5 mmol) in DCM (130 mL), under an argon atmosphere. The reaction mixture was allowed to warm to 5° C., quenched by addition of an aqueous solution of potassium sodium tartrate, diluted with DCM and H2O, stirred for 16 h at rt, and filtered through a pad of celite. The filtrate was extracted several times with DCM. The organic phase was washed with H2O and brine, dried (Na2SO4), filtered and concentrated. The residue was purified by by silica gel column chromatography (EtOAc/Hex, 1:1) to provide 2.54 g of the title compound as a beige solid: ESI-MS: 151.1 [M−H]−.

المصدر