Boron tribromide → Lasofoxifene

HRID 1987694Notes

Reaction equation

HRID 1987694 reaction equation
C[O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[C@@H:9]([C:13]1[CH:26]=[CH:25][C:16]([O:17][CH2:18][CH2:19][N:20]3[CH2:24][CH2:23][CH2:22][CH2:21]3)=[CH:15][CH:14]=1)[C@@H:8]([C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1)[CH2:7][CH2:6]2.B(Br)(Br)Br.C(=O)(O)[O-].[Na+]>C(Cl)Cl>[CH:30]1[CH:31]=[CH:32][C:27]([C@@H:8]2[C@H:9]([C:13]3[CH:14]=[CH:15][C:16]([O:17][CH2:18][CH2:19][N:20]4[CH2:24][CH2:23][CH2:22][CH2:21]4)=[CH:25][CH:26]=3)[C:10]3[CH:11]=[CH:12][C:3]([OH:2])=[CH:4][C:5]=3[CH2:6][CH2:7]2)=[CH:28][CH:29]=1

Participants

5

Reactant 3

HCID 25134Boron tribromideHCID 516892Sodium BicarbonateHCID 11373717rac 7-Methoxy Lasofoxifene

Product 1

HCID 216416LasofoxifeneYield 74%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a solution of 400 mg (0.94 mmol) of cis-1-{2-[4-(6-methoxy-2-phenyl 1,2,3,4-tetrahydronaphthalen-1-yl)phenoxy]ethyl}pyrrolidine in 25 mL of methylene chloride at 0° C. was added, dropwise with stirring, 4.7 ml (4.7 mmol) of a 1.0 M solution of boron tribromide in methylene chloride. After 3 hours at room temperature, the reaction was poured into 100 mL of rapidly stirring saturated aqueous sodium bicarbonate. The organic layer was separated, dried over sodium sulfate, filtered, and concentrated to afford 287 mg (74% yield) of lasofoxifene as the free base.

Workup

  1. customThe organic layer was separated
  2. dry with materialdried over sodium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated

Sources & evidence

ORD record
ord-a43b4259ffd9434fa22a9d7687029695
Source dataset
uspto-grants-2009_06
Patent number
US07553500B2

Reaction notes

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