2,5-Dichloropyridine → HCID 86680444, compound

HRID 240434Notes

Reaction equation

HRID 240434 reaction equation
[OH:1][C@H:2]1[C@H:6]2[CH2:7][N:8]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH2:9][CH2:10][N:5]2[CH2:4][CH2:3]1.Cl[C:19]1[CH:24]=[CH:23][C:22]([Cl:25])=[CH:21][N:20]=1.CC(C)([O-])C.[K+]>O1CCCC1>[Cl:25][C:22]1[CH:23]=[CH:24][C:19]([O:1][C@H:2]2[C@H:6]3[CH2:7][N:8]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH2:9][CH2:10][N:5]3[CH2:4][CH2:3]2)=[N:20][CH:21]=1

Participants

5

Reactant 3

HCID 276852,5-DichloropyridineHCID 23665647Potassium tert-butoxideHCID 86680445HCID 86680445, compound

Product 1

HCID 86680444HCID 86680444, compound

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
80 °C

Procedure

(8R*,8aR*)-tert-Butyl 8-hydroxyhexahydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate (Example 36A, 0.969 g, 4.0 mmol) and 2,5-dichloropyridine (0.651 g, 4.40 mmol) were treated with potassium tert-butoxide (0.987 g, 8.80 mmol) in dry tetrahydrofuran (5 mL). The mixture was heated to 80° C. and stirred for 16 hours. After the mixture cooled to room temperature, the mixture was purified via HPLC (Gilson®, Xbridge™ 30×100 mm column, eluted with pH=10 aqueous ammonium bicarbonate-ammonium hydroxide/methanol, UV=222 nm) to give the tert-butoxycarbonyl protected product, (8R*,8aR*)-tert-butyl 8-(5-chloropyridin-2-yloxy)hexahydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate. This tert-butoxycarbonyl compound was dissolved in dichloromethane (5 mL) and trifluoroacetic acid (2 mL) was added. The reaction mixture was stirred at room temperature for 3 hours. The mixture was concentrated and then purified via HPLC (Gilson®, Xbridge™ 30×100 mm column, eluted with pH=10 aqueous ammonium bicarbonate-ammonium hydroxide/methanol, UV=220 nm) to give the title compound. 1H NMR (300 MHz, methanol-d4) δ ppm 1.72-1.86 (m, 1H), 2.08-2.22 (m, 3H), 2.31-2.45 (m, 1H), 2.69-2.80 (m, 2H), 2.87-2.98 (m, 1H), 2.99-3.21 (m, 3H), 5.51 (ddd, 1H, J=7, 4, 2 Hz), 6.77 (d, 1H, J=9 Hz), 7.65 (dd, 1H, J=8, 2 Hz), 8.07 (d, 1H, J=2 Hz); MS (DCI) m/z 254 (M+H)+.

Workup

  1. temperatureAfter the mixture cooled to room temperature
  2. customthe mixture was purified via HPLC (Gilson®, Xbridge™ 30×100 mm column, eluted with pH=10 aqueous ammonium bicarbonate-ammonium hydroxide/methanol, UV=222 nm)

Sources & evidence

ORD record
ord-c69d373bc0bd4b07b5f659138e72ec0a
Source dataset
uspto-grants-2014_02
Patent number
US08648074B2

Reaction notes

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