(2R,3R,4R,5R,6S)-3,5-Bis-benzyloxy-2-methoxy-6-methyl-tetrahydro-pyran-4-ol 、
(2R,3S,4R,5R,6S)-2-Ethylsulfanyl-3,4,5-trimethoxy-6-methyl-tetrahydro-pyran 在
molecular sieve 、 iodonium di(2,4,6-trimethylpyridine) perchlorate 作用下,
以
乙醚 、
1,2-二氯乙烷 为溶剂,
以80%的产率得到(2S,3S,4R,5R,6S)-3,4,5-trimethoxy-2-[(2R,3R,4R,5S,6S)-2-methoxy-6-methyl-3,5-bis(phenylmethoxy)oxan-4-yl]oxy-6-methyloxane