Lawesson's reagent → 3-(3,5-Dichloro-benzenesulfonylamino)-4-methoxy-N-phenyl-thiobenzamide

HRID 1387596

Reaction equation

[Cl:1][C:2]1[CH:3]=[C:4]([S:9]([NH:12][C:13]2[CH:14]=[C:15]([CH:25]=[CH:26][C:27]=2[O:28][CH3:29])[C:16]([NH:18][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)=O)(=[O:11])=[O:10])[CH:5]=[C:6]([Cl:8])[CH:7]=1.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:39])=CC=1>O1CCCC1>[Cl:1][C:2]1[CH:3]=[C:4]([S:9]([NH:12][C:13]2[CH:14]=[C:15]([CH:25]=[CH:26][C:27]=2[O:28][CH3:29])[C:16]([NH:18][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)=[S:39])(=[O:11])=[O:10])[CH:5]=[C:6]([Cl:8])[CH:7]=1

Participants

Conditions

Temperature: 50 °C

Procedure

A mixture of 3-(3,5-dichloro-benzenesulfonylamino)-4-methoxy-N-phenyl-benzamide from Example 118 (3.61 g, 8.0 mmol) and Lawesson's reagent (3.57 g, 8.8 mmol) was stirred at room temperature overnight in tetrahydrofuran (250 mL). The reaction mixture was warmed to 50° C. for about one hour, then to 65° C. for about 4 hours then stirred at room temperature overnight. The mixture was concentrated to dryness and the residue dissolved in ethyl acetate and filtered through silica gel. Concentration of the eluant followed by trituration in hexanes/ethyl acetate (1:1) afforded the crude product (3.06 g). A portion (0.8 g) of this was chromatographed on silica gel in hexanes/ethyl acetate (1:1) to afford a pure sample (0.324 g); m.p. 206-208° C.

Workup

concentrationThe mixture was concentrated to dryness
dissolutionthe residue dissolved in ethyl acetate
filtrationfiltered through silica gel

Sources & evidence

ORD record: ord-a1c4d9bf5c8647c4802bdc219ee282bc
Source dataset: uspto-grants-2001_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06268387B1

Linked notes

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