Reaction #1583886

Reaction equation

LiCl

MeMgBr

diethyl ether

tert-butyl 3-oxopyrrolidine-1-carboxylate

NH4Cl

→

tert-butyl 3-hydroxy-3-methylpyrrolidine-1-carboxylate

Yield 83.8%

Solvents

THF

THF

Conditions

Workup

1. 1
   OtherTo a 30 L reaction kettle
2. 2
   workup.WAITAfter half an hour
3. 3
   workup.WAITThe stirring was continued for half an hour
4. 4
   OtherAfter the completion of reaction by HPLC detection
5. 5
   Otherto quench off
6. 6
   Otherthe reaction
7. 7
   ExtractionThe reaction was extracted with ethyl acetate
8. 8
   WashThe organic phase was washed with a saturated aqueous NaCl solution
9. 9
   Dryingdried over anhydrous sodium sulfate
10. 10
    Otherevaporated
11. 11
    Otherto remove the solvent

Procedure

To a 30 L reaction kettle was added 4 L dry THF at −10° C. After stirring, to the mixture were added ZnCl2 (118 g, 0.86 mol) and LiCl (402 g, 9.5 mol). After half an hour, to the resulting mixture was slowly added dropwisely a solution of MeMgBr (3 mol/L) in diethyl ether (6.4 L, 19.2 mol). The stirring was continued for half an hour. To the resulting mixture was slowly added a solution of tert-butyl 3-oxopyrrolidine-1-carboxylate (1600 g, 8.6 mol) in THF dropwisely. After the completion of reaction by HPLC detection, to the system was dropwisely added a saturated NH4Cl solution to quench off the reaction. The reaction was extracted with ethyl acetate. The organic phase was washed with a saturated aqueous NaCl solution, dried over anhydrous sodium sulfate, and evaporated to remove the solvent to produce tert-butyl 3-hydroxy-3-methylpyrrolidine-1-carboxylate as a pale-yellow solid (1450 g) in a yield of 83.8%.

Source