Ethanol → 7alpha-(5-Bromopentyl)-11beta-fluorooestra-1,3,5(10)-triene-3,17beta-diol

HRID 361679Notes

Reaction equation

[Br:1][CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][C@@H:7]1[CH2:24][C:23]2[CH:22]=[C:21]([OH:25])[CH:20]=[CH:19][C:18]=2[C@@H:17]2[C@@H:8]1[C@H:9]1[C@@:13]([CH2:15][C@@H:16]2[F:26])([CH3:14])[C:12](=[O:27])[CH2:11][CH2:10]1.C(O)C.O.[BH4-].[Na+]>O1CCCC1.CCCCCC.C(OCC)(=O)C>[Br:1][CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][C@@H:7]1[CH2:24][C:23]2[CH:22]=[C:21]([OH:25])[CH:20]=[CH:19][C:18]=2[C@@H:17]2[C@@H:8]1[C@H:9]1[C@@:13]([CH2:15][C@@H:16]2[F:26])([CH3:14])[C@@H:12]([OH:27])[CH2:11][CH2:10]1

Participants

Conditions

Temperature: 0 °C

Procedure

A solution of 16.2 g of 7α-(5-bromopentyl)-11β-fluoro-3-hydroxy-estra-1,3,5(10)-trien-17-one in 162 ml of tetrahydrofuran as well as 90 ml of ethanol and 36 ml of water are mixed in portions at 0° C. with 4.7 g of sodium borohydride and stirred for 2 hours at 0° C. Then, it is added to water, extracted four times with ethyl acetate, washed with water and common salt solution, dried on sodium sulfate and concentrated by evaporation in a vacuum. 17.1 g of crude product is obtained. After chromatography on silica gel with hexane/ethyl acetate, 15.6 g of pure 7α-(5-bromopentyl)-11β-fluoro-estra-1,3,5(10)-triene-3,17β-diol is obtained.

Workup

extractionextracted four times with ethyl acetate
washwashed with water and common salt solution
customdried on sodium sulfate
concentrationconcentrated by evaporation in a vacuum
custom17.1 g of crude product is obtained

Sources & evidence

ORD record: ord-8a9f40a3fab3412e9d154df120ba9961
Source dataset: uspto-grants-1999_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05866560

Reaction notes

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