Chloroacetic Acid → 20-(1,3-Dioxolan-2-yl)-3beta-acetoxy-1alpha-benzoyloxy-7alpha-(methoxycarbonyl)oxypregn-5-ene
Reaction equation
[O:1]1[CH2:5][CH2:4][O:3][CH:2]1[CH:6]([C@@H:8]1[C@:25]2([CH3:26])[C@H:11]([C@H:12]3[C@H:22]([CH2:23][CH2:24]2)[C@:20]2([CH3:21])[C@:15](O)([CH2:16][C@@H:17]([O:36][C:37](=[O:39])[CH3:38])[CH2:18][C@@H:19]2[O:27][C:28](=[O:35])[C:29]2[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=2)[CH:14]=[CH:13]3)[CH2:10][CH2:9]1)[CH3:7].ClCC(O)=O.[C:46](=[O:51])([O:49]C)[O:47][CH3:48]>>[O:1]1[CH2:5][CH2:4][O:3][CH:2]1[CH:6]([C@@H:8]1[C@:25]2([CH3:26])[C@H:11]([C@H:12]3[C@H:22]([CH2:23][CH2:24]2)[C@:20]2([CH3:21])[C:15]([CH2:16][C@@H:17]([O:36][C:37](=[O:39])[CH3:38])[CH2:18][C@@H:19]2[O:27][C:28](=[O:35])[C:29]2[CH:30]=[CH:31][CH:32]=[CH:33][CH:34]=2)=[CH:14][C@H:13]3[O:51][C:46]([O:47][CH3:48])=[O:49])[CH2:10][CH2:9]1)[CH3:7]Participants
4
Conditions
- Temperature
- 100 °C
Procedure
In 10 ml of dimethyl carbonate was dissolved 350 mg of 20-(1,3-dioxolan-2-yl)-3β-acetoxy-1α-benzoyloxypregn-6-en-5α-ol, followed by addition of 0.1 ml of monochloroacetic acid. The mixture was stirred in an atmosphere of argon gas under heating at a temperature of 100° C. for 10 hours. The reaction mixture was then worked up in the same manner as Example 132 to give 100 mg of 20-(1,3-dioxolan- 2-yl)-3β-acetoxy-1α-benzoyloxy-7α-(methoxycarbonyl)oxypregn-5-ene showing the following physical properties.
Sources & evidence
- ORD record
- ord-717e594e4c0d47e593ef42ba338b922f
- Source dataset
- uspto-grants-1994_10
- Patent number
- US05359055
Reaction notes
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