(2S,3R,6S)-2-Methyl-6-{(2S,3S,6S)-2-methyl-6-[(2S,3S,6S)-2-methyl-6-(3,3,9-trimethyl-1,5-dioxa-spiro[5.5]undec-9-yloxy)-tetrahydro-pyran-3-yloxy]-tetrahydro-pyran-3-yloxy}-3,6-dihydro-2H-pyran-3-ol 以
二氯甲烷 为溶剂,
以94%的产率得到(2S,6R)-2-Methyl-6-{(2S,3S,6S)-2-methyl-6-[(2S,3S,6S)-2-methyl-6-(3,3,9-trimethyl-1,5-dioxa-spiro[5.5]undec-9-yloxy)-tetrahydro-pyran-3-yloxy]-tetrahydro-pyran-3-yloxy}-6H-pyran-3-one