Oxygen → HCID 9910286, compound

Participants

Reaction Steps

To 5 mL of methylene chloride were added 1.0 mg of TPP and 95.1 mg (0.24 mmol) of 4-t-butyl-5-(4-hydroxy-2-(p-methoxyphenyl)benzo[d]oxazol-6-yl)-3,3-dimethyl-2,3-dihydrofuran (Compound [67]), and the mixture was externally irradiated with a 940 W sodium lamp in an oxygen atmosphere for30 minutes. After the resulting mixture was concentrated, the concentrate was applied to a silica gel column and the elution was carried out with the mixture of hexane and ethyl acetate (hexane:ethyl acetate=3:1), and then followed by recrystallization from the mixture of methylene chloride and hexane to obtain 95.8 mg of 5-t-butyl-1-(4-hydroxy-2-(p-methoxyphenyl)benzo[d]oxazol-6-yl)-4,4-dimethyl-2,6,7-trioxabicyclo[3.2.0]heptane (Compound [68]) as colorless granular micro-crystal. Yield 93.1%.

Provenance & Evidence