3,4-dihydro-2H-pyran → 7alpha-(5-Acetoxypentyl)-11beta-fluoro-3-(tetrahydro-pyran-2-yloxy)oestra-1,3,5(10)-trien-17-one
Reaction equation
[C:1]([O:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][C@@H:10]1[CH2:27][C:26]2[CH:25]=[C:24]([OH:28])[CH:23]=[CH:22][C:21]=2[C@@H:20]2[C@@H:11]1[C@H:12]1[C@@:16]([CH2:18][C@@H:19]2[F:29])([CH3:17])[C:15](=[O:30])[CH2:14][CH2:13]1)(=[O:3])[CH3:2].[O:31]1[CH:36]=[CH:35][CH2:34][CH2:33][CH2:32]1.O.C1(C)C=CC(S(O)(=O)=O)=CC=1.C(N(CC)CC)C>C1COCC1.C(OCC)(=O)C>[C:1]([O:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][C@@H:10]1[CH2:27][C:26]2[CH:25]=[C:24]([O:28][CH:32]3[CH2:33][CH2:34][CH2:35][CH2:36][O:31]3)[CH:23]=[CH:22][C:21]=2[C@@H:20]2[C@@H:11]1[C@H:12]1[C@@:16]([CH2:18][C@@H:19]2[F:29])([CH3:17])[C:15](=[O:30])[CH2:14][CH2:13]1)(=[O:3])[CH3:2]Participants
7
Reactant 4
Product 1
Reagents, catalysts & solvents 2
Procedure
8.2 g of 7α-(5-acetoxypentyl)-11β-fluoro-3-hydroxy-estra-1,3,5(10)-trien-17-one in 86 ml of THF is stirred with 8.6 ml of 3,4-dihydro-2H-pyran and 820 mg of p-toluenesulfonic acid hydrate for 2.5 hours at room temperature. Then, 0.5 ml of triethylamine is added, it is diluted with ethyl acetate, washed with saturated sodium chloride solution, dried and concentrated by evaporation in a vacuum. After the crude product is chromatographed on silica gel with a hexane-ethyl acetate gradient, 7.8 g of 7α-(5-acetoxypentyl)-11β-fluoro-3-(tetrahydropyran-2-yloxy)-estra-1,3,5(1 0)-trien- 17-one is obtained as foam.
Workup
- washwashed with saturated sodium chloride solution
- customdried
- concentrationconcentrated by evaporation in a vacuum
- customAfter the crude product is chromatographed on silica gel with a hexane-ethyl acetate gradient
Sources & evidence
- ORD record
- ord-762b00ea2f5c4e169553f906b2ab7c9b
- Source dataset
- uspto-grants-2001_08
- Patent number
- US06271403B1
Reaction notes
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