Diisopropylethylamine → 1,1-Dimethylethyl N-((4-hydroxy-7-methoxy-2-oxo-2',3',5',6'-tetrahydro-spiro[naphthalene-1,4'-pyran]-3-yl)carbonyl)glycinate

Participants

Reaction Conditions

Reaction Steps

A mixture of ethyl 4-hydroxy-7-methoxy-2-oxo-2′,3′,5′,6′-tetrahydro-spiro[naphthalene-1,4′-pyran]-3-carboxylate (0.52 g, 1.6 mmol), tert-butyl 2-aminoacetate hydrochloride (0.39 g, 2.3 mmol) in 5 mL dioxane was treated with N-ethyl-N-isopropylpropan-2-amine (0.61 g, 4.7 mmol). The mixture was warmed to 86° C. and stirred for 4 hours, M+1=418. The mixture was cooled to room temperature and concentrated in vacuo. The crude product was purified by column chromatography eluting with 10-30% EtOAc/hexane to give 0.35 g of the title compound as a pale yellow solid. MS (m/z)=418 (M+H)+.

Provenance & Evidence