Sodium ethoxide → Tert-butyl 4-(7-methoxy-3-(2-(methylamino)pyrimidin-4-yl)naphthalen-1-yl)piperazine-1-carboxylate

Participants

Reaction Steps

To a solution of tert-butyl 4-(3-(3-(dimethylamino)acryloyl)-7-methoxynaphthalen-1-yl)piperazine-1-carboxylate 108 (1.5 g) in ethanol (50 ml) was added methyl amino guanidine hydrochloride (0.75 g) and 21% wt sodium ethoxide in ethanol (1 ml). The reaction was stirred at reflux for 2 days, and more sodium ethoxide (0.5 ml) was added to the reaction. The reaction was allowed to reflux overnight. The solvents were concentrated under reduced pressure and the residue was redissolved in ethyl acetate (100 ml) and water (50 ml). The organics were separated, washed with water (1×50 ml), dried over sodium sulfate and concentrated. Column chromatography (pre-packed SiO2, 40% ethyl acetate in hexanes to 75% ethyl acetate in hexanes) gave tert-butyl 4-(7-methoxy-3-(2-(methylamino)pyrimidin-4-yl)naphthalen-1-yl)piperazine-1-carboxylate 111 as a light yellow solid. LC/MS (m/z): 450 [M+H].

Provenance & Evidence