Acetic Acid → 20-(5,5-Dimethyl-1,3-dioxan-2-yl)-3beta-(tert-butyldimethylsilyl)oxy-1alpha-(methoxymethyl)oxy-7alpha-(methoxycarbonyl)oxypregn-5-ene
Reaction equation
[CH3:1][C:2]1([CH3:42])[CH2:7][O:6][CH:5]([CH:8]([C@@H:10]2[C@:27]3([CH3:28])[C@H:13]([C@H:14]4[C@H:24]([CH2:25][CH2:26]3)[C@:22]3([CH3:23])[C@:17](O)([CH2:18][C@@H:19]([O:33][Si:34]([C:37]([CH3:40])([CH3:39])[CH3:38])([CH3:36])[CH3:35])[CH2:20][C@@H:21]3[O:29][CH2:30][O:31][CH3:32])[CH:16]=[CH:15]4)[CH2:12][CH2:11]2)[CH3:9])[O:4][CH2:3]1.C(O)(=O)C.[C:47](=[O:52])([O:50]C)[O:48][CH3:49]>>[CH3:42][C:2]1([CH3:1])[CH2:7][O:6][CH:5]([CH:8]([C@@H:10]2[C@:27]3([CH3:28])[C@H:13]([C@H:14]4[C@H:24]([CH2:25][CH2:26]3)[C@:22]3([CH3:23])[C:17]([CH2:18][C@@H:19]([O:33][Si:34]([C:37]([CH3:38])([CH3:39])[CH3:40])([CH3:35])[CH3:36])[CH2:20][C@@H:21]3[O:29][CH2:30][O:31][CH3:32])=[CH:16][C@H:15]4[O:52][C:47]([O:48][CH3:49])=[O:50])[CH2:12][CH2:11]2)[CH3:9])[O:4][CH2:3]1Participants
4
Reactant 3
Product 1
Procedure
In 10 ml of dimethyl carbonate was dissolved 400 mg of 20-(5,5-dimethyl-1,3-dioxan-2-yl)-3β-(tert-butyldimethylsilyl)oxy-1α-(methoxymethyl)oxypregn-6-en-5α-ol, followed by addition of 0.2 ml of acetic acid. The mixture was refluxed in an atmosphere of argon gas for 12 hours. The reaction mixture was then worked up in the same manner as Example 132 to give 120 mg of 20-(5,5-dimethyl-1,3-dioxan-2-yl)-3β-(tert-butyldimethylsilyl)oxy-1α-(methoxymethyl)oxy-7α-(methoxycarbonyl)oxypregn-5-ene showing the following physical properties.
Workup
- temperatureThe mixture was refluxed in an atmosphere of argon gas for 12 hours
Sources & evidence
- ORD record
- ord-10447b0204094d4d93fd10ccbd48ccf9
- Source dataset
- uspto-grants-1992_05
- Patent number
- US05112998
Reaction notes
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