Aniline → 2-[4-(2-Allyloxy-6-fluoro-4-morpholin-4-yl-phenylamino)-5-chloro-pyrimidin-2-ylamino]-5-methyl-8,9-dihydro-5h-7-oxa-5-aza-benzocyclohepten-6-one

Participants

Reaction Steps

10-Camphorsulfonic acid (3.4 mg, 0.015 mmol), 2-Amino-5-methyl-8,9-dihydro-5H-7-oxa-5-aza-benzocyclohepten-6-one (28 mg, 0.15 mmol), and (2-Allyloxy-6-fluoro-4-morpholin-4-yl-phenyl)-(2,5-dichloro-pyrimidin-4-yl)-amine (59 mg, 0.15 mmol) in Isopropyl alcohol (3 mL) was irradiated in a CEM microwave (120° C., 30 min). The solution was neutralized by the addition of MP-Carbonate (2.69 mmol/g loading; 0.10 g, 0.269 mmol), filtered and conc. in vacuo. The resultant oil was chromatographed (ISCO, 12 g SiO2, 0-100% EtOAc:Hex) to afford the product as the second eluting peak. The isolated product was contaminated in a 1:1 ratio with remaining 2-Amino-5-methyl-8,9-dihydro-5H-7-oxa-5-aza-benzocyclohepten-6-one as determined by 1H-NMR. The mixture of product and 2-Amino-5-methyl-8,9-dihydro-5H-7-oxa-5-aza-benzocyclohepten-6-one (32 mg) was dissolved in dioxane (5 mL) and aq. satd. sodium bicarbonate (1 mL) was added. 9-Fluorenylmethyl chloroformate (21 mg, 0.081 mmol) was added, and the mixture was stirred under an atmosphere of Nitrogen. HPLC/LCMS showed FMOC-incorporation onto the impurity aniline. A second aliquot of 9-Fluorenylmethyl chloroformate (42 mg, 0.16 mmol) was added and stirred for an additional 48 h. The solution was diluted with EtOAc (10 mL) and water (5 mL). The layers were separated, the aq. extracted with 5 mL DCM, and the combined organics dried over sodium sulfate, then conc. onto 1.5 g SiO2. Chromatography (ISCO, 12 g, 0-85% EtOAc:Hex) afforded 4 major peaks, the last eluting at 80% being 2-[4-(2-Allyloxy-6-fluoro-4-morpholin-4-yl-phenylamino)-5-chloro-pyrimidin-2-ylamino]-5-methyl-8,9-dihydro-5H-7-oxa-5-aza-benzocyclohepten-6-one as a beige foam (14 mg, 17%). LCMS: 555 (M+H); 1H-NMR (CDCl3): 8.01 (s, 1H), 7.50 (s, 1H), 7.15 (d, 1H, J=8.9 Hz), 6.93 (d, 1H, J=8.1 Hz), 6.86 (s, 1H), 5.92 (m, 1H), 5.30 (d, 1H, J=17.0 Hz), 5.21 (d, 1H, J=10.6 Hz), 4.52 (m, 2H), 4.41 (t, 2H, J=6.3 Hz), 3.86 (m, 4H), 3.34 (s, 3H), 3.16 (m, 4H), 2.78 (t, 2H, J=6.3 Hz).

Provenance & Evidence