Reaction equation
[C:1]([O:4][C@@:5]1([CH2:26][CH2:27][CH3:28])[CH2:10][CH2:9][C@H:8]2[C@H:11]3[C@H:21]([CH2:22][CH2:23][C@:6]12[CH3:7])[C@:19]1([CH3:20])[C@H:14]([CH2:15][C@@H:16]([OH:25])[CH2:17][C@@H:18]1[CH3:24])[CH2:13][CH2:12]3)(=[O:3])[CH3:2].[CH3:29][O:30][CH2:31]OC.O=P12OP3(OP(OP(O3)(O1)=O)(=O)O2)=O>ClCCl>[C:1]([O:4][C@@:5]1([CH2:26][CH2:27][CH3:28])[CH2:10][CH2:9][C@H:8]2[C@H:11]3[C@H:21]([CH2:22][CH2:23][C@:6]12[CH3:7])[C@:19]1([CH3:20])[C@H:14]([CH2:15][C@@H:16]([O:25][CH2:29][O:30][CH3:31])[CH2:17][C@@H:18]1[CH3:24])[CH2:13][CH2:12]3)(=[O:3])[CH3:2]Participants
5
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Procedure
400 mg of 17β-acetoxy-1α-methyl-17α-n-propyl-5α-androstan-3β-ol is combined in 2.8 ml of absolute dichloromethane and 1.8 ml of formaldehyde dimethylacetal with a mixture of 600 mg of kieselguhr W 20 and 300 mg of phosphorus pentoxide and stirred for 45 minutes at room temperature. The mixture is vacuum-filtered from the insoluble components and washed with dichloromethane containing 3-5% triethylamine. The crude product obtained after evaporation is chromatographed on silica gel, thus producing 280 mg of 17β-acetoxy-3β-methoxymethoxy-1α-methyl-17α-n-propyl-5α-androstane.
Workup
- filtrationThe mixture is vacuum-filtered from the insoluble components
- washwashed with dichloromethane containing 3-5% triethylamine
- customThe crude product obtained
- customafter evaporation
- customis chromatographed on silica gel
Sources & evidence
- ORD record
- ord-c964f846aaf14c5789db35504ede80cd
- Source dataset
- uspto-grants-1990_01
- Patent number
- US04892867
Linked notes
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