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Preparation of the title compound was initiated by subjecting the product from step 2 A (0.02 g, 0.03 mmol) to isoindoline (0.01 g, 0.06 mmol) andDBU (0.01 g, 0.06 mmol) in 1 mL DCM at 45 0C for 3 h. Once complete byMS analysis, the reaction was diluted with 10 mL EtOAc and extracted withNaHCtheta3 (2 x 10 mL) and brine (2 x 20 mL). The organic phase was dried over anhydrous Na2SO4, filtered, and then concentrated in vacuo. The residue was purified by silica gel flash chromatography using 70%EtOAc/hexanes affording pyridazinone 4a. (0.01 g, 64 %).MS (ESI) m/z = 755.3 (M+H)+.
As always, wish you can browse a selection of our May HOT articles below about Isoindoline.
Reference:
Patent; ENANTA PHARMACEUTICALS, INC.; WO2008/19266; (2008); A2;,
Indoline – Wikipedia,
Indoline | C8H9N – PubChem