4-Cyanobenzohydrazide → HCID 67006530, compound

HRID 2388416Notes

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].[C:19]([C:21]1[CH:30]=[CH:29][C:24]([C:25]([NH:27][NH2:28])=[O:26])=[CH:23][CH:22]=1)#[N:20]>>[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:28][NH:27][C:25](=[O:26])[C:24]2[CH:23]=[CH:22][C:21]([C:19]#[N:20])=[CH:30][CH:29]=2)=[O:14])[CH:5]=[CH:6][C:7]=1[C:8]#[N:9]

Participants

Reactant 2

HCID 4567324-Cyanobenzohydrazide

HCID 57908671(3-Chloro-4-cyano-2-methylphenyl)-D-threonine2×

Product 1

HCID 67006530HCID 67006530, compoundYield 78.4%

Conditions

Temperature: 0 °C

Procedure

(2R,3S)-2-(3-chloro-4-cyano-2-methylphenylamino)-3-hydroxybutanoic acid (intermediate 1a) (10.03 g, 37.3 mmol) and 4-cyano-benzohydrazide (6.02 g, 37.3 mmol) were coupled in an analogous procedure as described for the preparation of intermediate 3b. The crude product was purified by boiling in chloroform (100 mL) followed by cooling to 0° C. and filtration to yield product as a light yellow solid (12.05 g, 78%). 1H NMR (400 MHz, acetone-d6, δ in ppm) 9.81 (br s, 2H), 8.08 (AA′XX′, J=8.6 Hz, 2H), 7.91 (AA′XX′, J=8.7 Hz, 2H), 7.51 (d, J=8.7 Hz, 1H), 6.69 (d, J=8.8 Hz, 1H), 5.57 (d, J=7.0 Hz, 1H), 4.40 (m, 1H), 2.34 (dd, J=3.6, 6.9 Hz, 1H), 2.34 (s, 3H), 1.35 (d, J=6.4 Hz, 3H).

Workup

customThe crude product was purified
filtrationfiltration

Sources & evidence

ORD record: ord-de61cbbf4b0b4f409a68efdf38d7c3b9
Source dataset: uspto-grants-2012_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08268872B2

Reaction notes

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