Sodium borohydride → 3-[(4-Chloro-benzyl)-(2-hydroxy-ethyl)-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester

HRID 1983789Notes

Reaction equation

[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][CH:10]([N:13]([CH2:19][C:20]2[CH:25]=[CH:24][C:23]([Cl:26])=[CH:22][CH:21]=2)[CH2:14][C:15](OC)=[O:16])[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[BH4-].[Na+]>CO>[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][CH:10]([N:13]([CH2:19][C:20]2[CH:21]=[CH:22][C:23]([Cl:26])=[CH:24][CH:25]=2)[CH2:14][CH2:15][OH:16])[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

Conditions

Temperature: 65 °C

Procedure

To a solution of 3-[(4-chloro-benzyl)-methoxycarbonylmethyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester (0.44 g, 1.15 mmol) in methanol cooled to 0° C. was added sodium borohydride (0.13 g, 3.45 mmol) and the resulting mixture was heated to 65° C. for 16 h. Additional sodium borohydride (0.26 g, 6.90 mmol) was added to the reaction mixture and stirred further at 65° C. for 18 h. The reaction mixture was concentrated, dissolved in ethyl acetate and washed with saturated aqueous sodium bicarbonate. The aqueous layer was extracted with ethyl acetate. The combined organics were dried over sodium sulfate. The crude product was purified on silica using gradient elution from hexane/ethyl acetate (50%) to ethyl acetate (100%). ESI-MS m/z: 355 (M+1), UV retention time: 1.27 min.

Workup

concentrationThe reaction mixture was concentrated
dissolutiondissolved in ethyl acetate
washwashed with saturated aqueous sodium bicarbonate
extractionThe aqueous layer was extracted with ethyl acetate
dry with materialThe combined organics were dried over sodium sulfate
customThe crude product was purified on silica using gradient elution from hexane/ethyl acetate (50%) to ethyl acetate (100%)

Sources & evidence

ORD record: ord-8d5ab267d28a4c84af269c57cbe9d2cd
Source dataset: uspto-grants-2009_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07541365B2

Reaction notes

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