4,8,8-Trimethylthiopyrano[2,3-f]chromen-2-one 在
potassium carbonate potassium dioxotetrahydroxoosmate(VI) 、 (DHQ)2-PHAL 、 potassium hexacyanoferrate(III) 作用下,
以32.3%的产率得到(3R,4R)-3,4-Dihydroxy-2,2,8-trimethyl-3,4-dihydro-2H-1-oxa-5-thia-phenanthren-6-one