20-(5,5-Dimethyl-1,3-dioxan-2-yl)-1alpha,2alpha-epoxy-7alpha-methoxycarbonyloxypregn-5-en-3beta-yl acetate → 1alpha,2alpha-Epoxy-21,21-dimethoxy-20-methylpregna-5,7-dien-3beta-yl acetate
Reaction equation
[C:1]([O:4][C@H:5]1[C@@H:28]2[O:29][C@@H:27]2[C@@:26]2([CH3:30])[C:7](=[CH:8][C@@H:9](OC(OC)=O)[C@@H:10]3[C@@H:25]2[CH2:24][CH2:23][C@@:22]2([CH3:31])[C@H:11]3[CH2:12][CH2:13][C@@H:14]2[CH:15]([CH3:21])[CH:16]([O:19][CH3:20])[O:17][CH3:18])[CH2:6]1)(=[O:3])[CH3:2].C(O[C@H]1[C@@H]2O[C@@H]2[C@@]2(C)C(=C[C@@H](OC(OC)=O)[C@@H]3[C@@H]2CC[C@@]2(C)[C@H]3CC[C@@H]2C(C2OCC(C)(C)CO2)C)C1)(=O)C>>[C:1]([O:4][C@H:5]1[C@@H:28]2[O:29][C@@H:27]2[C@@:26]2([CH3:30])[C:7](=[CH:8][CH:9]=[C:10]3[C@@H:25]2[CH2:24][CH2:23][C@@:22]2([CH3:31])[C@H:11]3[CH2:12][CH2:13][C@@H:14]2[CH:15]([CH3:21])[CH:16]([O:17][CH3:18])[O:19][CH3:20])[CH2:6]1)(=[O:3])[CH3:2]Participants
3
Reactant 2
Product 1
Procedure
The procedure of Example 17 was repeated except that 40.4 mg (0.0798 mmole) of 1α,2α-epoxy-21,21-dimethoxy-7α-methoxycarbonyloxy-20-methylpregn-5-en-3β-yl acetate was used in lieu of 43.6 mg of 20-(5,5-dimethyl-1,3-dioxan-2-yl)-1α,2α-epoxy-7α-methoxycarbonyloxypregn-5-en-3β-yl acetate to give 15.6 mg of 1α,2α-epoxy-21,21-dimethoxy-20-methylpregna-5,7-dien-3β-yl acetate. In addition, 14.1 mg of the starting compound 1α,2α-epoxy-21,21-dimethoxy-7α-methoxycarbonyloxy-20-methylpregn-5-en-3β-yl acetate was recovered. The yield of 1α,2α-epoxy-21,21-dimethoxy-20-methylpregna-5,7-dien-3β-yl acetate was 70% based on consumed 1α,2α-epoxy-21,21-dimethoxy-7α-methoxycarbonyloxy-20-methylpregn-5-en-3β-yl acetate.
Sources & evidence
- ORD record
- ord-7a1e58c94a03435aac7ec334ad59cf05
- Source dataset
- uspto-grants-1992_05
- Patent number
- US05112998
Reaction notes
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