(R/S)-Ethyl 2-Acetoxy-4-phenyl-4H-chromene-3-carboxylate

(R/S)-Ethyl 2-Acetoxy-4-phenyl-4H-chromene-3-carboxylate

Blog Article

A simple protocol for the preparation of O-acylated enol MEDI C PLUS W/CA form (R/S)-ethyl-2-acetoxy-4-phenyl-4H-chromene-3-carboxylate 5 was presented.The compound was characterized by 1H-, 13C-and DEPT135 NMR spectra, including {1H,1H} COSY, {1H,13C} HSQC, {1H,13C} HMBC, and 2D-NOESY spectra.The preferred regioselectivity for O-acylation of 3,4-dihydrocoumarin 5 in the presence of Misc 25% substituent in the 4th position in the chroman ring and accounting for the steric hindrance of the ester group in the 3rd place was confirmed.