3-Chloro-6-hydroxyacetophenone → N-[(E)-1-(5-chloro-2-hydroxyphenyl)ethylideneamino]-3-pyrrolidin-1-ylsulfonylbenzamide

HRID 1777053Notes

Reaction equation

[N:1]1([S:6]([C:9]2[CH:10]=[C:11]([CH:16]=[CH:17][CH:18]=2)[C:12]([NH:14][NH2:15])=[O:13])(=[O:8])=[O:7])[CH2:5][CH2:4][CH2:3][CH2:2]1.[Cl:19][C:20]1[CH:21]=[CH:22][C:23]([OH:29])=[C:24]([C:26](=O)[CH3:27])[CH:25]=1>CO.C(O)(=O)C>[Cl:19][C:20]1[CH:21]=[CH:22][C:23]([OH:29])=[C:24](/[C:26](=[N:15]/[NH:14][C:12](=[O:13])[C:11]2[CH:16]=[CH:17][CH:18]=[C:9]([S:6]([N:1]3[CH2:2][CH2:3][CH2:4][CH2:5]3)(=[O:7])=[O:8])[CH:10]=2)/[CH3:27])[CH:25]=1

Participants

Conditions

Temperature: 120 °C

Procedure

3-(pyrrolidin-1-ylsulfonyl)benzohydrazide (105 mg, 0.390 mmol) and 1-(5-chloro-2-hydroxyphenyl)ethanone (66.5 mg, 0.390 mmol) was dissolved in Methanol (Volume: 4 ml) in the presence of acetic acid as a catalyst and then the reaction mixture was heated via microwave irradiation to 120° C. for 30 min. Reaction was monitored by TLC. After completion of the reaction, following cooling, the solvent was removed by vacuum and the resulting crude material was purified by flash column chromatography (2% CH3OH/CH2Cl2) afforded the title compound (E)-N′-(1-(5-chloro-2-hydroxyphenyl)ethylidene)-3-(pyrrolidin-1-ylsulfonyl)benzohydrazide (70 mg, 0.163 mmol, 41.7% yield) as a solid. 1H NMR (CDCl3, 400 MHz): δ 8.18 (m, 1H), 8.13 (m, 1H), 7.95 (d, 1H, J=7.6 Hz), 7.65 (t, 1H, J=7.6 Hz), 7.41 (m, 1H), 7.21 (m, 1H), 6.93 (d, 1H, J=8.8 Hz), 3.23 (m, 4H), 2.39 (s, 3H), 1.75 (m, 4H). Mass [M+H]+: 422.1

Workup

customReaction
customAfter completion of the reaction
temperaturefollowing cooling
customthe solvent was removed by vacuum
customthe resulting crude material was purified by flash column chromatography (2% CH3OH/CH2Cl2)

Sources & evidence

ORD record: ord-7e81cfe5321e46bbbc5e7932239de343
Source dataset: uspto-grants-2016_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09266838B2

Reaction notes

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