Triethylamine → (S)-1-benzyl 4-methyl 2-(9-phenyl-9H-fluoren-9-ylamino)succinate

HRID 1873873Notes

Reaction equation

HRID 1873873 reaction equation
[NH2:1][C@@H:2]([CH2:13][C:14]([O:16][CH3:17])=[O:15])[C:3]([O:5][CH2:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)=[O:4].Br[C:19]1([C:32]2[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=2)[C:31]2[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=2[C:25]2[C:20]1=[CH:21][CH:22]=[CH:23][CH:24]=2.CCN(CC)CC>C(Cl)Cl>[C:32]1([C:19]2([NH:1][C@@H:2]([CH2:13][C:14]([O:16][CH3:17])=[O:15])[C:3]([O:5][CH2:6][C:7]3[CH:8]=[CH:9][CH:10]=[CH:11][CH:12]=3)=[O:4])[C:31]3[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=3[C:25]3[C:20]2=[CH:21][CH:22]=[CH:23][CH:24]=3)[CH:33]=[CH:34][CH:35]=[CH:36][CH:37]=1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 2316249-Bromo-9-phenylfluoreneHCID 129676051-benzyl 4-methyl (2S)-2-aminobutanedioate

Product 1

HCID 66648506(S)-1-benzyl 4-methyl 2-(9-phenyl-9H-fluoren-9-ylamino)succinate

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Pb(NO3)2 (6.06 g, 18.3 mmol) was added over 1 min to a CH2Cl2 (80 mL) solution of (S)-1-benzyl 4-methyl 2-aminosuccinate (4.50 g, 19.0 mmol), 9-bromo-9-phenyl-9H-fluorene (6.44 g, 20.0 mmol) and Et3N (3.0 mL, 21.5 mmol), and the heterogeneous mixture was stirred at ambient condition for 48 hr. The mixture was filtered and the filtrate was treated with MgSO4 and filtered again, and the final filtrate was concentrated. The resulting crude material was submitted to a Biotage purification (350 g silica gel, CH2Cl2 elution) to afford (S)-1-benzyl 4-methyl 2-(9-phenyl-9H-fluoren-9-ylamino)succinate as highly viscous colorless oil (7.93 g). 1H NMR (DMSO-d6, δ=2.5 ppm, 400 MHz): δ 7.82 (m, 2H), 7.39-7.13 (m, 16H), 4.71 (d, J=12.4, 1H), 4.51 (d, J=12.6, 1H), 3.78 (d, J=9.1, NH), 3.50 (s, 3H), 2.99 (m, 1H), 2.50-2.41 (m, 2H, partially overlapped with solvent). LC (Cond. 1): RT=2.16 min; LC/MS: Anal. Calcd. for [M+H]+ C31H28NO4: 478.20. found 478.19.

Workup

  1. filtrationThe mixture was filtered
  2. additionthe filtrate was treated with MgSO4
  3. filtrationfiltered again
  4. concentrationthe final filtrate was concentrated
  5. customThe resulting crude material was submitted to a Biotage purification (350 g silica gel, CH2Cl2 elution)

Sources & evidence

ORD record
ord-13ff36ab3b98458889b04af6cd5a2651
Source dataset
uspto-grants-2012_11
Patent number
US08303944B2

Reaction notes

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