Potassium Phosphate, Tribasic → HCID 117600741, compound

Participants

Reaction Conditions

Reaction Steps

A microwave reaction vessel was charged with potassium phosphate (tribasic) (0.670 g, 3.16 mmol), (S)-3-chloro-5′,6′-dihydrospiro[chromeno[2,3-c]pyridine-5,4′-[1,3]oxazine]-2′,7-diamine (0.2 g, 0.631 mmol), and 2-(5,6-dihydro-2H-pyran-3-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (0.398 g, 1.894 mmol) in dioxane (4 ml) and water (2 ml). The vessel was capped and the solution was purged with nitrogen for 10 minutes. Next, bis[di-tert-butyl(4 dimethylaminophenyl)phosphine]dichloropalladium(II) (0.022 g, 0.032 mmol) was added and the vessel was sealed. The reaction mixture was stirred and heated in a Initiator microwave reactor (Personal Chemistry, Biotage AB, Inc., Upssala, Sweden) at 120° C. for 35 minutes. The reaction was poured into water and the mixture was extracted with EtOAc. The combined organic extracts were washed with saturated aqueous sodium chloride and dried over sodium sulfate. The solution was filtered and concentrated in vacuo to give the crude material. The crude material was purified by silica gel chromatography by eluting with 20:1 solution of DCM to a 2M solution of NH3 in MeOH, to provide (S)-3-(5,6-dihydro-2H-pyran-3-yl)-5′,6′-dihydrospiro[chromeno[2,3-c]pyridine-5,4′-[1,3]oxazine]-2′,7-diamine (0.172 g, 0.472 mmol, 74.8% yield) as an off-white solid.

Provenance & Evidence