Diisopropylamine → 2-(3-Methyl-2-pent-1-ynyl-benzoylamino)-indan-2-carboxylic acid ethyl ester

Participants

Reaction Steps

To a solution of 2-(2-iodo-3-methyl-benzoylamino)-indan-2-carboxylic acid ethyl ester (693 mg, 1.54 mmol) in anhydrous DMF (5 mL) and DIPA (diisopropylamine, 10 mL) is added Pd(PPh3)4 (89 mg, 7.7% mmol), CuI (29 mg, 0.154 mmol) and pent-1-yne (1.5 mL, 15.4 mmol). The resulting solution is covered in argon and run in a microwave reaction: 110° C., 35 minutes. After the removal of DMF and DIPA in vacuo, the residue is dissolved in EtOAc (100 mL) and washed with water (1×10 mL) and brine (2×10 mL). The organic layer is dried over anhydrous Na2SO4 and concentrated in vacuo. The residue is purified by flash column chromatography (120 g silica gel, gradient elution: 0%-40% EtOAc in heptane) to give a pure product (122) as a pale yellow solid (144 mg, 24%).

Provenance & Evidence