Reacción #68278

Ecuación de reacción

sodium triacetoxyborohydride

sodium triacetoxyborohydride

sodium triacetoxyborohydride

1-(2-(4-aminopiperidin-1-yl)ethyl)-7-methoxyquinoxalin-2(1H)-one

tert-butyl (5-formyl-2-methylphenyl)carbamate

sodium hydrogen carbonate

→

tert-butyl (5-(((1-(2-(7-methoxy-2-oxoquinoxalin-1(2H)-yl)ethyl)piperidin-4-yl)amino)methyl)-2-methylphenyl)carbamate

Rendimiento 81.2%

Disolventes

acetic acid

acetic acid

methylene chloride

acetic acid

chloroform

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONwere added
2. 2
   workup.STIRRINGstirred for 10 hours
3. 3
   workup.WAITto stand overnight
4. 4
   workup.STIRRINGstirred for 40 min
5. 5
   workup.STIRRINGstirred at room temperature for 2 hours and 40 min
6. 6
   workup.STIRRINGstirred for 40 min
7. 7
   workup.STIRRINGstirred at room temperature for 2 hours
8. 8
   Otrothe organic layer was separated
9. 9
   Extracciónthe aqueous layer was extracted with chloroform
10. 10
    Secadodried over anhydrous magnesium sulfate
11. 11
    Otrothe solvent was removed under reduced pressure
12. 12
    OtroThe residue thus obtained
13. 13
    Otrowas purified by silica gel column chromatography [eluent; chloroform:methanol=5:1]

Procedimiento

To 10 mL of a methylene chloride solution containing 0.20 g of 1-(2-(4-aminopiperidin-1-yl)ethyl)-7-methoxyquinoxalin-2(1H)-one, 0.19 g of tert-butyl (5-formyl-2-methylphenyl)carbamate and 45 μL of acetic acid were added, and stirred for 30 min. To the reaction mixture, 0.21 g of sodium triacetoxyborohydride was added, and stirred for 10 hours. After allowed to stand overnight, 45 μl of acetic acid was added and stirred for 40 min, then 0.17 g of sodium triacetoxyborohydride was added, and stirred at room temperature for 2 hours and 40 min. 90 μL of acetic acid was further added and stirred for 40 min, then 0.34 g of sodium triacetoxyborohydride was added, and stirred at room temperature for 2 hours. To the reaction mixture, aqueous saturated sodium hydrogen carbonate solution and chloroform were added, the organic layer was separated, and the aqueous layer was extracted with chloroform. The organic layer and extracts were combined, dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. The residue thus obtained was purified by silica gel column chromatography [eluent; chloroform:methanol=5:1], to give 0.28 g of tert-butyl (5-(((1-(2-(7-methoxy-2-oxoquinoxalin-1(2H)-yl)ethyl)piperidin-4-yl)amino)methyl)-2-methylphenyl)carbamate as a pale yellow oil.

Fuente