Methylamine → 2-Methyl-1,3-dioxoisoindoline-5-carboxylic acid

Participants

Reaction Steps

To a microwave vial was added 1,3-dioxo-1,3-dihydroisobenzofuran-5-carboxylic acid (200 mg, 1.041 mmol), THF (2 mL) and methylamine (2.0M THF, 2.0 mL). The flask was irradiated in a microwave at 100° C. for 5 min. At this time, AcOH (glacial, 0.4 mL) and an additional portion of methylamine (2.0M THF, 2.0 mL) were added, and the flask was placed in a the microwave at 100° C. for 2 h. The flask was allowed to cool and then azeotropically dried (toluene, 3×5 mL). The flask was placed under a high vacuum for 12 h to provide 2-methyl-1,3-dioxoisoindoline-5-carboxylic acid which was used directly in the amide coupling reaction without further purification.

Provenance & Evidence