2,6-Dichlorobenzaldehyde → Methyl 3-[2-(2,6-dichlorophenyl)-4-phenylsulfanyl-1,2,3,4-tetrahydroquinolin-6-yl]-2-[(2-methylpropan-2-yl)oxycarbonylamino]propanoate

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Reaction Steps

Methyl 3-(4-aminophenyl)-2-[(tert-butoxycarbonyl)amino]propanoate 4 (38.2 g) solubilized in a 50/50 mixture of CH3CN/CH2Cl2 is added, at room temperature, to a mixture of Yb(OTf)3 (0.05 equ.) and MgSO4 (3 equ.) in CH3CN/CH2Cl2 (50/50,400 ml). Solid 2,6-dichlorobenzaldehyde (1.1 equ.) is then added and after 2 h, phenyl vinyl sulfide (1.2 equ.) is added dropwise. After one night, insolubles are filtered and the solvents evaporated. The residue is purified by silica gel chromatography using hexane mixture/AcOEt 80/20 as eluent to give methyl 2-[(tert-butoxycarbonyl)amino]-3-[2-(2,6-dichlorophenyl)-4-(phenylsulfanyl)-1,2,3,4-tetrahydro-6-quinolinyl]propanoate 5.

Provenance & Evidence