Methylamine → 3-{[3-{[(5-Chloro-2-thienyl)sulfonyl]amino}-4-(methyloxy)-1H-indazol-1-yl]methyl}-N-methylbenzamide

Participants

Reaction Conditions

Reaction Steps

Methyl 3-{[3-[[(5-chloro-2-thienyl)sulfonyl]({[2-(trimethylsilyl)ethyl]oxy}methyl)amino]-4-(methyloxy)-1H-indazol-1-yl]methyl}benzoate (for a preparation see Intermediate 31) (70 mg, 0.112 mmol) in a Biotage microwave vial was added 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine (Aldrich) (7.83 mg, 0.056 mmol) and methylamine solution in THF (2M, 1.125 mL). The reaction vessel was sealed and heated in a Biotage Initiator microwave oven using initial very high absorption level to 80° C. for 75 min. The reaction mixture was diluted with DCM (2 mL) and water (3 mL). The organic phase was separated, and the aqueous layer was further extracted with DCM (2 mL). The combined organic solutions were dried through an hydrophobic frit and concentrated under a nitrogen stream in a blowdown unit. The residue was treated TBAF in THF (1M, 1.125 mL, 1.125 mmol). The reaction vessel was sealed and heated in a Biotage Initiator at 110° C. for 15 min (very high absorption level). The solvent was removed under a nitrogen stream in a blowdown unit (T=35° C. overnight), dissolved in 1:1 MeOH-DMSO (2 mL) and purified by Mass Directed AutoPrep on standard C18 column using Acetonitrile Water with a TFA modifier (Method B). The solvent was removed under a stream of nitrogen in a Radleys blowdown apparatus to give the title compound (41.7 mg, 75%) LCMS (System A) RT=1.03 min, ES+ve m/z 491/493 (M+H)+.

Provenance & Evidence