3-Chloro-4-hydroxybenzohydrazide → N'-((2R,3S)-2-(3-Chloro-4-cyano-2-methylphenylamino)-3-hydroxybutanoyl)-3-chloro-4-hydroxybenzohydrazide

HRID 1254696Notes

Reaction equation

HRID 1254696 reaction equation
[Cl:1][C:2]1[C:3]([CH3:18])=[C:4]([NH:10][C@H:11]([C@@H:15]([OH:17])[CH3:16])[C:12]([OH:14])=O)[CH:5]=[CH:6][C:7]=1[C:8]#[N:9].[Cl:19][C:20]1[CH:21]=[C:22]([CH:27]=[CH:28][C:29]=1[OH:30])[C:23]([NH:25][NH2:26])=[O:24]>>[Cl:1][C:2]1[C:3]([CH3:18])=[C:4]([NH:10][C@H:11]([C@@H:15]([OH:17])[CH3:16])[C:12]([NH:26][NH:25][C:23](=[O:24])[C:22]2[CH:27]=[CH:28][C:29]([OH:30])=[C:20]([Cl:19])[CH:21]=2)=[O:14])[CH:5]=[CH:6][C:7]=1[C:8]#[N:9]

Participants

3

Reactant 2

HCID 109542683-Chloro-4-hydroxybenzohydrazideHCID 57908671(3-Chloro-4-cyano-2-methylphenyl)-D-threonine

Product 1

HCID 67006146N'-((2R,3S)-2-(3-Chloro-4-cyano-2-methylphenylamino)-3-hydroxybutanoyl)-3-chloro-4-hydroxybenzohydrazideYield 82%

Conditions

Temperature
0 °C

Procedure

(2R,3S)-2-(3-chloro-4-cyano-2-methylphenylamino)-3-hydroxybutanoic acid (1.02 g, 3.8 mmol) and 3-chloro-4-hydroxybenzohydrazide (711 mg, 3.8 mmol) were coupled in an analogous fashion as the procedure used for the preparation of intermediate 3b. The crude product was purified by boiling in chloroform (50 mL) followed by cooling to 0° C. and filtration to yield product as a white solid (1.36 g, 82%). 1H NMR (400 MHz, acetone-d6, δ in ppm) 7.93 (d, J=2.2 Hz, 1H), 7.75 (dd, J=2.2, 8.4 Hz, 1H), 7.52 (d, J=8.8 Hz, 1H), 7.08 (d, J=8.6 Hz, 1H), 6.67 (m, 1H), 5.55 (d, J=6.8 Hz, 1H), 4.38 (m, 1H), 4.10 (dd, J=3.1, 7.0 Hz, 1H), 2.36 (s, 3H), 1.34 (d, J=6.5 Hz, 3H).

Workup

  1. customThe crude product was purified
  2. filtrationfiltration

Sources & evidence

ORD record
ord-057f3812a9d04030b3e2abe3d4526a17
Source dataset
uspto-grants-2013_06
Patent number
US08455525B2

Reaction notes

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