HCID 22061439, compound → HCID 23508587, compound

Participants

Reaction Conditions

Reaction Steps

4.28 g of 3,6-di-(4′-chlorophenyl)-pyrrolo[3,4,c]pyrrole-1,4-dione, 5.91 g 2-pentyl dicarbonate from Example B2, 0.40 g of 4-dimethylaminopyridine and 500 ml of dry tetrahydrofuran are mixed and the mixture is stirred at 55° C. for 4 hours. The suspension is filtered off with suction on a glass microfilter supporting a cotton filter, the solvent is evaporated off under reduced pressure, and the residue is admixed with 50 ml of isopropanol. After 30 minutes the precipitate is filtered off with suction and washed with 15 ml of isopropanol, and the yellow product is dried under reduced pressure to leave 2.86 g (41% of theory) of 2,5-di-2-pentyloxycarbonyl-3,6-di-(4′-chlorophenyl)-pyrrolo[3,4,c]pyrrole-1,4-dione as yellow powder. NMR (CDCl3) [ppm]: δ=7.65 ppm (d, 4H), 7.46 (d, 4H), 4.98 (m, 2H), 1.67-1.35 (m, 8H), 1.26 (d, 6H), 0.88 (t, 6H).

Provenance & Evidence