4-Chloro-2-sulfanylbenzoic acid → tert-Butyl 3-[6-(7-chloro-4-oxo-4H-1,3-benzothiazin-2-yl)-2-pyridyl]propanoate
Reaction equation
[Cl:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]([OH:8])=O)=[C:4]([SH:11])[CH:3]=1.[C:12]([C:14]1[N:19]=[C:18]([CH2:20][CH2:21][C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH:17]=[CH:16][CH:15]=1)#[N:13]>N1C=CC=CC=1>[Cl:1][C:2]1[CH:10]=[CH:9][C:5]2[C:6](=[O:8])[N:13]=[C:12]([C:14]3[N:19]=[C:18]([CH2:20][CH2:21][C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH:17]=[CH:16][CH:15]=3)[S:11][C:4]=2[CH:3]=1Participants
4
Procedure
4-Chloro-2-mercaptobenzoic acid (2.60 g, 13.7 mmol) and tert-butyl 3-(6-cyano-2-pyridyl)propanoate (1.60 g, 6.9 mmol) were dissolved in pyridine (15 ml), and the mixture was refluxed for 13 hrs. The reaction mixture was concentrated under reduced pressure, subjected to silica gel column chromatography and eluted with hexane-ethyl acetate (3:1, v/v) to give the titled compound (1.42 g, 51%).