Ethyl 2-chloroacetoacetate → 5-Thiazolecarboxylic acid, 2-(3-cyano-4-(2-methylpropoxy)phenyl)-4-methyl-, ethyl ester

HRID 870880Notes

Reaction equation

[C:1]([C:3]1[CH:4]=[C:5]([CH:9]=[CH:10][C:11]=1[O:12][CH2:13][CH:14]([CH3:16])[CH3:15])[C:6](=[S:8])[NH2:7])#[N:2].[CH2:17]([O:19][C:20](=[O:26])[CH:21](Cl)[C:22]([CH3:24])=O)[CH3:18]>C1(C)C=CC=CC=1>[C:1]([C:3]1[CH:4]=[C:5]([C:6]2[S:8][C:21]([C:20]([O:19][CH2:17][CH3:18])=[O:26])=[C:22]([CH3:24])[N:7]=2)[CH:9]=[CH:10][C:11]=1[O:12][CH2:13][CH:14]([CH3:16])[CH3:15])#[N:2]

Participants

Conditions

Temperature: 25 °C

Procedure

Toluene (50 mL) was placed into a round bottom flask and 3-cyano-4-isobutoxybenzothioamide (5.0 g) was added, followed by addition of ethyl-2-chloroacetoacetate (4.25 g). The mixture was heated to reflux and maintained until reaction completion. After the reaction was completed, the mass was cooled to about 25° C. and maintained at that temperature for about 20 minutes. The reaction mass was then filtered and the solid was washed with toluene (10 mL). The wet solid was dried at about 75° C. to a constant weight to yield 4.0 g of the title compound. Purity by HPLC: 99.41%.

Workup

temperatureThe mixture was heated
temperatureto reflux
temperaturemaintained until reaction completion
temperaturemaintained at that temperature for about 20 minutes
filtrationThe reaction mass was then filtered
washthe solid was washed with toluene (10 mL)
customThe wet solid was dried at about 75° C. to a constant weight

Sources & evidence

ORD record: ord-ac7505bb8dba440dab118362b4c89b5c
Source dataset: uspto-grants-2015_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08969582B2

Reaction notes

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