Glycolic Acid → (S)-N-[3-(4-cyano-2-ethyl-6-methyl-phenoxy)-2-hydroxy-propyl]-2-hydroxy-acetamide

HRID 1685721Notes

Reaction equation

HRID 1685721 reaction equation
[NH2:1][CH2:2][C@H:3]([OH:17])[CH2:4][O:5][C:6]1[C:13]([CH3:14])=[CH:12][C:9]([C:10]#[N:11])=[CH:8][C:7]=1[CH2:15][CH3:16].[C:18](O)(=[O:21])[CH2:19][OH:20].C1C=CC2N(O)N=NC=2C=1.CCN=C=NCCCN(C)C.Cl>C([O-])(O)=O.[Na+]>[C:10]([C:9]1[CH:12]=[C:13]([CH3:14])[C:6]([O:5][CH2:4][C@@H:3]([OH:17])[CH2:2][NH:1][C:19](=[O:20])[CH2:18][OH:21])=[C:7]([CH2:15][CH3:16])[CH:8]=1)#[N:11]

Participants

6

Reactant 4

HCID 757Glycolic AcidHCID 757711-HydroxybenzotriazoleHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 66932187(S)-4-(3-amino-2-hydroxypropoxy)-3-ethyl-5-methylbenzonitrile

Product 1

HCID 66932427(S)-N-[3-(4-cyano-2-ethyl-6-methyl-phenoxy)-2-hydroxy-propyl]-2-hydroxy-acetamideYield 90.4%

Reagents, catalysts & solvents 1

HCID 516892Sodium BicarbonateSolvent

Procedure

To a solution of (S)-4-(3-amino-2-hydroxypropoxy)-3-ethyl-5-methylbenzonitrile (6.23 g, 26.59 mmol), glycolic acid (2.43 g, 31.9 mmol), HOBt (4.31 g, 31.9 mmol), and EDC hydrochloride (6.12 g, 31.9 mmol) are added. The mixture is stirred at rt for 18 h before it is diluted with sat. aq. NaHCO3 and extracted twice with EA. The combined organic extracts are dried over MgSO4, filtered and concentrated. The crude product is purified by CC with DCM containing 8% of methanol to give (S)—N-[3-(4-cyano-2-ethyl-6-methyl-phenoxy)-2-hydroxy-propyl]-2-hydroxy-acetamide (7.03 g) as a yellow oil; LC-MS: tR=0.74 min; [M+1]+=293.10; 1H NMR (CDCl3): δ 1.25 (t, J=7.5 Hz, 3H), 2.32 (s, 3H), 2.69 (q, J=7.5 Hz, 2H), 3.48-3.56 (m, 3H), 3.70-3.90 (m, 3H), 4.19 (s, br, 3H), 7.06 (m, 1H), 7.36 (s, 1H), 7.38 (s, 1H). b) The above nitrile is converted to the N-hydroxy-benzamidine according to literature procedures (e.g. E. Meyer, A. C. Joussef, H. Gallardo, Synthesis 2003, 899-905); LC-MS: tR=0.51 min; [M+1]+=326.13; 1H NMR (D6-DMSO): δ 1.17 (t, J 7.4 Hz, 3H), 2.24 (s, 3H), 2.62 (q, J 7.4 Hz, 2H), 3.23 (m, 1H), 3.43 (m, 1H), 3.67 (m, 2H), 3.83 (s, 2H), 3.93 (m, 1H), 5.27 (s br, 1H), 5.58 (s br, 1H), 5.70 (s, 2H), 7.34 (s, 1H), 7.36 (s, 1H), 7.67 (m, 1H), 9.46 (s br, 1H).

Workup

  1. extractionextracted twice with EA
  2. dry with materialThe combined organic extracts are dried over MgSO4
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customThe crude product is purified by CC with DCM containing 8% of methanol

Sources & evidence

ORD record
ord-15f5f6017fa94cbc8237f5309d84c35a
Source dataset
uspto-grants-2012_04
Patent number
US08148410B2

Reaction notes

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