Diisopropylethylamine → (Z)-3H-[1,2,3]triazolo[4,5-b]pyridin-3-yl 5-((5-fluoro-2-oxoindolin-3-ylidene)methyl)-2,4-dimethyl-1H-pyrrole-3-carboxylate

Participants

Reaction Steps

15 (10 g, 33.3 mmol) was suspended in DMF (50 ml, 5 P.) and stirred for 5 minutes. DIPEA (9.0 mL, 54.5 mmol) was then added and the mixture was stirred for 10 minutes. HATU (13.95 g, 36.7 mmol) was added and the reaction mixture was stirred at 25° C. for completion. HPLC was applied to detect the completion of the reaction. Most of the DMF was removed by rotary evaporating and the residue was suspended in MeCN (100 mL, 10 P.) and stirred for another 1 hour. The solid was collected by filtration, washed with MeCN, and dried under vacuum at 40° C. overnight. The intermediate (Z)-3H-[1,2,3]triazolo[4,5-b]pyridin-3-yl 5-((5-fluoro-2-oxoindolin-3-ylidene)methyl)-2,4-dimethyl-1H-pyrrole-3-carboxylate (15b) (12 g, 86.5 percent yield) with 86.8% HPLC purity as a yellow powder was got. 1H NMR (300 MHz, DMSO-d6): δ 2.61 (s, 3H, H-31), 2.68 (s, 3H, H-16), 6.87 (m, 1H, H-2), 7.01 (m, 1H, H-6), 7.64 (m, 1H, H-10), 7.85 (m, 1H, H-3), 8.73 (dd, J=1.5, 1.2 Hz, 1H, H-28), 8.83 (dd, J=1.2, 1.5 Hz, 1H, H-27), 13.11 (s, 1H, NH). To a 15b (10.0 g, 23.9 mmol) DMF solution was added N,N-diethylethane-1,2-diamine (7; 3.33 g, 28.7 mmol), the reaction mixture was stirred at 25° C. for completion. HPLC was applied to detect the completion of the reaction. Most of the DMF was removed by rotary evaporating and the residue was suspended in MeCN (100 mL, 10 P.) and stirred for another 1 hour. The solid was collected by filtration, washed with MeCN, and dried under vacuum at 40° C. overnight to give Sunitinib (8.38 g, 88% yield) with 77.6% HPLC purity.

Provenance & Evidence