Triethylamine → (S)-3-((E)-2-{3-Benzyloxy-4-[1,1,4-trioxo-5-(2-trimethylsilanylethyl)-1,2,5-thiadiazolidin-2-yl]-phenyl}-vinyl)-3,4-dihydro-1H-isoquinoline-2-carboxylic Acid Tert-butyl Ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-(2-benzyloxy-4-iodophenyl)-1,1-dioxo-2-(2-trimethylsilanylethyl)-1,2,5-thiadiazolidin-3-one (0.77 g, 1.4 mmol) and (S)-3-vinyl-3,4-dihydro-1H-isoquinoline-2-carboxylic acid tert-butyl ester (0.44 g, 1.7 mmol) in acetonitrile (5 mL) in a pressure vessel is added Et3N (0.32 mL, 2.3 mmol) followed by di-t-butyl-phosphinobiphenyl (0.017 g, 0.057 mmol). The solution is degassed by nitrogen sparging for 10 min, and then Pd(OAc)2 (0.006 g, 0.028 mmol) is added and the mixture is heated to 80° C. for 18 h. The mixture is cooled to RT and is diluted with 1N HCl and extracted with EtOAc (2×30 mL). The organic layer is washed with brine (3×30 mL) and dried over Na2SO4. The solvent is removed under reduced pressure and the residue purified by flash chromatography using a gradient of 5 to 30% EtOAc in hexanes to give the title compound.

Provenance & Evidence