Ethanol → 8-[2-(Methylamino)-2-(4-methyl-1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]-2-(4-methyl-5-oxo-2,5-dihydrofuran-3-yl)-2,8-diazaspiro[4.5]decan-1-one

Participants

Reaction Steps

To a mixture of 8-(2-(4-methyl-1-oxo-1,3-dihydroisobenzofuran-5-yl)-2-oxoethyl)-2-(4-methyl-5-oxo-2,5-dihydrofuran-3-yl)-2,8-diazaspiro[4.5]decan-1-one (25 mg, 0.057 mmol) and methyl amine (4 mg, 0.114 mmol) in anhydrous THF was added Ti(O-iPr)4 (35 μL, 0.114 mmol). The reaction was sealed and shaken at ambient temperature for 16 hr. To this reaction, EtOH (200 proof, 0.5 mL) was added followed by adding NaBH4 (11 mg, 0.171 mmol) portion-wise within 30 min. The reaction was shaken for 3 hr and quenched with water (0.5 mL). The reaction was partitioned between EtOAc (4 mL×2) and ammonium (2N, 1.5 mL). The organic phase was combined and evaporated under reduced pressure. The residue was dissolved in DMSO (1.5 mL) and filtered. The crude product was purified by using reversed-phase HPLC (Acetonitrile with 0.1% TFA: water with 0.1% TFA from 10% to 60%) to give the title compound. LC-MS (IE, m/z): 454 [M+1]+.

Provenance & Evidence