Trifluoroacetic acid methylene chloride → (2S,4S)-4-(9H-Fluoren-9-ylmethoxycarbonylamino)-pyrrolidine-2-carboxylic acid benzyl ester trifluoroacetate

HRID 1481917Notes

Reaction equation

HRID 1481917 reaction equation
C(OC([N:8]1[CH2:12][C@@H:11]([NH:13][C:14]([O:16][CH2:17][CH:18]2[C:30]3[CH:29]=[CH:28][CH:27]=[CH:26][C:25]=3[C:24]3[C:19]2=[CH:20][CH:21]=[CH:22][CH:23]=3)=[O:15])[CH2:10][C@H:9]1[C:31]([O:33][CH2:34][C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1)=[O:32])=O)(C)(C)C.[C:41]([OH:47])([C:43]([F:46])([F:45])[F:44])=[O:42].C(Cl)Cl>>[F:44][C:43]([F:46])([F:45])[C:41]([OH:47])=[O:42].[CH2:34]([O:33][C:31]([C@@H:9]1[CH2:10][C@H:11]([NH:13][C:14]([O:16][CH2:17][CH:18]2[C:30]3[CH:29]=[CH:28][CH:27]=[CH:26][C:25]=3[C:24]3[C:19]2=[CH:20][CH:21]=[CH:22][CH:23]=3)=[O:15])[CH2:12][NH:8]1)=[O:32])[C:35]1[CH:36]=[CH:37][CH:38]=[CH:39][CH:40]=1

Participants

3

Reactant 2

HCID 21863450Trifluoroacetic acid methylene chlorideHCID 68283347(2S,4S)-4-(9H-fluoren-9-ylmethoxycarbonylamino)-pyrrolidine-1,2-dicarboxylic acid 2-benzyl ester 1-tert-butyl ester

Product 1

HCID 90220138(2S,4S)-4-(9H-Fluoren-9-ylmethoxycarbonylamino)-pyrrolidine-2-carboxylic acid benzyl ester trifluoroacetate

Procedure

A mixture of 20 mL TFA/DCM (1:1) at 0° C. was added to (2S,4S)-4-(9H-fluoren-9-ylmethoxycarbonylamino)-pyrrolidine-1,2-dicarboxylic acid 2-benzyl ester 1-tert-butyl ester (0.92 g, 0.17 mmol) at 0° C., the cooling bath was removed and the mixture stirred for 2 h. The mixture was concentrated and triturated with diethyl ether to give (2S,4S)-4-(9H-Fluoren-9-ylmethoxycarbonylamino)-pyrrolidine-2-carboxylic acid benzyl ester trifluoroacetate (0.94 g) as a white solid.

Workup

  1. customthe cooling bath was removed
  2. concentrationThe mixture was concentrated
  3. customtriturated with diethyl ether

Sources & evidence

ORD record
ord-13e6e4f32b2a4080bd942d232f0bab32
Source dataset
uspto-grants-2016_08
Patent number
US09409888B2

Reaction notes

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