반응 #41260

반응 방정식

Sodium triacetoxyborohydride

product

2-(4′-((3aR,6aR)-hexahydropyrrolo[3,4-b]pyrrol-1(2H)-yl)biphenyl-4-yl)pyridazin-3(2H)-one

acetaldehyde

HOAc

→

title compound

2-(4′-((3aR,6aR)-5-ethylhexahydropyrrolo[3,4-b]pyrrol-1(2H)-yl)biphenyl-4-yl)pyridazin-3(2H)-one

용매

NaHCO3

반응 조건

후처리

1. 1
   workup.STIRRINGthe mixture was stirred for 3 hours
2. 2
   추출extracted three times with 25 mL of 5% n-propanol in CHCl3
3. 3
   건조the combined extracts were dried over Na2SO4
4. 4
   여과filtered
5. 5
   기타absorbed on silica gel
6. 6
   기타The crude material was chromatographed
7. 7
   세척eluting with 1% aqueous NH4OH in EtOAc/MeOH (9:1)

실험 절차

The product from Example 85B (0.050 g, 0.140 mmol) and acetaldehyde (10.0 μL, 0.140 mmol) were combined in 5 mL of dichloroethane containing 3 drops of HOAc and stirred at ambient temperature for 10 minutes. Sodium triacetoxyborohydride (0.039 g, 0.182 mmol) was added and the mixture was stirred for 3 hours. The mixture was diluted with 20 mL of aqueous NaHCO3 and extracted three times with 25 mL of 5% n-propanol in CHCl3 and the combined extracts were dried over Na2SO4, filtered, and absorbed on silica gel. The crude material was chromatographed, eluting with 1% aqueous NH4OH in EtOAc/MeOH (9:1), to provide the title compound, 1H NMR (300 MHz, CDCl3) δ ppm 7.91 (d, J=2.0 Hz, 1H), 7.63 (s, 4H), 7.50 (d, J=8.5 Hz, 2H), 7.23 (d, J=3.7 Hz, 1H), 7.07 (d, J=9.2 Hz, 1H), 6.65 (d, J=8.8 Hz, 2H), 4.11-4.25 (m, 1H), 3.47-3.60 (m, 1H), 3.24-3.39 (m, 1H), 2.88-3.05 (m, 1H), 2.78 (dd, J=9.5, 6.4 Hz, 1H), 2.56-2.70 (m, 2H), 2.35-2.56 (m, 3H), 2.10-2.25 (m, 1H), 1.85-2.02 (m, 1H), 1.26 (s, 1H), 1.09 (t, J=7.1 Hz, 2H). MS (ESI+) m/z 387 (M+H)+.

출처