10-Camphorsulfonyl chloride → 7,7-Dimethyl-1-(4-o-tolyl-piperazine-1-sulfonylmethyl)-bicyclo[2.2.1]heptan-2-one

HRID 265340Notes

Reaction equation

Cl.[C:2]1([CH3:14])[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[N:8]1[CH2:13][CH2:12][NH:11][CH2:10][CH2:9]1.[CH3:15][C:16]1([CH3:29])[C:20]2([CH2:24][S:25](Cl)(=[O:27])=[O:26])[C:21]([CH2:23][CH:17]1[CH2:18][CH2:19]2)=[O:22]>C(Cl)(Cl)Cl>[CH3:15][C:16]1([CH3:29])[CH:17]2[CH2:18][CH2:19][C:20]1([CH2:24][S:25]([N:11]1[CH2:10][CH2:9][N:8]([C:3]3[CH:4]=[CH:5][CH:6]=[CH:7][C:2]=3[CH3:14])[CH2:13][CH2:12]1)(=[O:27])=[O:26])[C:21](=[O:22])[CH2:23]2

Participants

Conditions

Temperature: 0 °C

Procedure

To a stirred, 0° C. solution of 1-(o-tolyl) piperazine hydrochloride (50.0 g; 235 mmol) and TEA (83 mL; 590 mmol) in chloroform (1000 mL) was added (+)-10-camphorsulfonyl chloride (65.5 g; 260 mmol). The solution was stirred at 0° C. for 1 h and then at ambient temperature for 3 h. The solution was extracted with 5% aqueous HCl (2×500 mL), water (500 mL), and saturated aqueous NaHCO3 (2×500 mL). The organic phase was dried (MgSO4), filtered, and the solvent was removed under reduced pressure. The resulting solid was recrystallized from methanol to give the title compound, mp 112°-114° C. (69 g; 75%).

Workup

waitat ambient temperature for 3 h
extractionThe solution was extracted with 5% aqueous HCl (2×500 mL), water (500 mL), and saturated aqueous NaHCO3 (2×500 mL)
dry with materialThe organic phase was dried (MgSO4)
filtrationfiltered
customthe solvent was removed under reduced pressure
customThe resulting solid was recrystallized from methanol

Sources & evidence

ORD record: ord-6602a83b31554f03910b9377b526e06f
Source dataset: uspto-grants-1997_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05648352

Reaction notes

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