Triethylamine → (R)-(-)-1-CBZ-3-pyrrolidinol

HRID 895104Notes

Reaction equation

HRID 895104 reaction equation
[OH:1][C@@H:2]1[CH2:6][CH2:5][NH:4][CH2:3]1.C(N(CC)CC)C.Cl[C:15]([O:17][CH2:18][C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)=[O:16]>C(Cl)Cl>[OH:1][C@@H:2]1[CH2:6][CH2:5][N:4]([C:15]([O:17][CH2:18][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)=[O:16])[CH2:3]1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 10387Benzyl chloroformateHCID 2759337(R)-3-Pyrrolidinol

Product 1

HCID 11183628(R)-(-)-1-CBZ-3-pyrrolidinolYield 62%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
0 °C

Procedure

3-Hydroxy-(R)-pyrrolidine (8.71 g, 0.1 mol) was dissolved in CH2Cl2 (260 mL) and cooled to 0° C. Triethylamine (33.5 mL, 0.24 mol) and benzyl chloroformate (14.9 mL, 0.11 mol) were added, and the resulting solution was stirred for 2 h at 0° C. The solution was gradually warmed to room temperature and allowed to stir overnight. The solution was washed with 1 M HCl, saturated NaHCO3, and brine. The organic solution was dried over MgSO4 and concentrated. The crude product was purified by column chromatography eluting with ethyl acetate to afford 13.7 g (62% yield, 2 steps) of the desired product as a purple oil.

Workup

  1. temperatureThe solution was gradually warmed to room temperature
  2. stirringto stir overnight
  3. washThe solution was washed with 1 M HCl, saturated NaHCO3, and brine
  4. dry with materialThe organic solution was dried over MgSO4
  5. concentrationconcentrated
  6. customThe crude product was purified by column chromatography
  7. washeluting with ethyl acetate

Sources & evidence

ORD record
ord-10cba454024346c69c6ee226f2ea5054
Source dataset
uspto-grants-2005_07
Patent number
US06914048B2

Reaction notes

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