Ethanolamine → Dihydrothebaine

HRID 920598Notes

Reaction equation

[CH3:1][N:2]1[C@@H:18]2[CH2:19][C:7]3[CH:8]=[CH:9][C:10]([O:22][CH3:23])=[C:11]4[O:12][C@H:13]5[C:14]([O:20][CH3:21])=[CH:15][CH:16]=[C:17]2[C@:5]5([C:6]=34)[CH2:4][CH2:3]1.C(CN)O.O>COCC(O)C>[CH3:1][N:2]1[C@@H:18]2[CH2:19][C:7]3[CH:8]=[CH:9][C:10]([O:22][CH3:23])=[C:11]4[O:12][C@H:13]5[C:14]([O:20][CH3:21])=[CH:15][CH2:16][C@@H:17]2[C@:5]5([C:6]=34)[CH2:4][CH2:3]1

Participants

Conditions

Temperature: 110 °C

Procedure

Thebaine (4.0 g dry basis, 12.9 mmol) is placed in a mixture of 1-methoxy-2-propanol (13.0 g) and ethanolamine (1.3 g, 21.3 mmol, 1.65 equiv) and is heated to 110° C. In anther vessel, p-toluenesulfonylhydrazide (4.8 g, 25.8 mmol, 2.0 equiv) is dissolved at room temperature in a mixture of ethanolamine (9.6 g, 157.2 mol, 12.2 equiv) and 1-methoxy-2-propanol (0.8 g) and the solution is added in portions to the thebaine mixture over about a 2 hour period while maintaining the batch temperature at ˜110° C. The reaction mixture is held at 110 to 112° C. for 1 hour then cooled to 22° C. and water (24 g) added while maintaining the batch temperature at ≦30° C. The resulting slurry (pH 10.8) is filtered and the product is washed with water (3×8 g) and dried at 40° C. to constant weight to give 8,14-dihydrothebaine (3.63 g, 90.1% yield; 98.8 area % purity by HPLC).

Workup

temperaturewhile maintaining the batch temperature at ˜110° C
temperaturethen cooled to 22° C.
temperaturewhile maintaining the batch temperature at ≦30° C
filtrationThe resulting slurry (pH 10.8) is filtered
washthe product is washed with water (3×8 g)
customdried at 40° C. to constant weight

Sources & evidence

ORD record: ord-2c499785308c4c328c22aac913e8e6af
Source dataset: uspto-grants-2016_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09273060B2

Reaction notes

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