(2R,4aR,6S,7R,8aS)-6-Methoxy-7-methyl-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxine

(2S,5S,6S)-2-Methoxy-5-methyl-6-trityloxymethyl-dihydro-pyran-3-one

(2S,3R,6S)-2-Methoxy-3-methyl-5-methylene-6-trityloxymethyl-tetrahydro-pyran