Dimethylformamide → 2,2-Dimethyl-4(tol-4-yl)-thiochrom-3-en-6-al

HRID 2615

Reaction equation

[CH3:1][C:2]1([CH3:20])[CH:11]=[C:10]([C:12]2[CH:17]=[CH:16][C:15]([CH3:18])=[CH:14][CH:13]=2)[C:9]2[C:4](=[CH:5][CH:6]=[C:7](Br)[CH:8]=2)[S:3]1.[Li]CCCC.CN([CH:29]=[O:30])C>C1COCC1.CCCCCC>[CH3:1][C:2]1([CH3:20])[CH:11]=[C:10]([C:12]2[CH:17]=[CH:16][C:15]([CH3:18])=[CH:14][CH:13]=2)[C:9]2[C:4](=[CH:5][CH:6]=[C:7]([CH:29]=[O:30])[CH:8]=2)[S:3]1

Participants

Conditions

Temperature: -10 °C

Procedure

To a cold (-78° C.) solution of 2,2-dimethyl-4(tol-4-yl)-6-bromo-thiochrom-3-ene (Compound N, 280 mg, 0.81 mmol) in THF (5 mL) was added n-BuLi in hexane (1.6M solution, 0.66 mL). The mixture was gradually warmed to -10° C. over 25 min. and recooled to -78° C. To this solution was added DMF (80 mg, 1.1 mmol) and stirred at ambient temperature for 5 hours. The reaction was quenched by adding water (10 mL), ethyl acetate (100 mL), and the organic layer was washed with brine (10 mL), dried and the solvent removed by distillation. The crude material was used in the next reaction without further purification.

Workup

customrecooled to -78° C
customThe reaction was quenched
additionby adding water (10 mL), ethyl acetate (100 mL)
washthe organic layer was washed with brine (10 mL)
customdried
customthe solvent removed by distillation
customThe crude material was used in the next reaction without further purification

Sources & evidence

ORD record: ord-f87472e8ca554a2c98f783fae6d659cb
Source dataset: uspto-grants-1998_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05728846

Linked notes

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