(2R,3R,4R,5R,6S)-3,5-Bis-benzyloxy-2-methoxy-6-methyl-tetrahydro-pyran-4-ol 、
(2S,3R,4R,5S,6S)-4-Allyloxy-3,5-bis-benzyloxy-2-ethylsulfanyl-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82%的产率得到methyl O-(3-O-allyl-2,4-di-O-benzyl-α-L-rhamnopyranosyl)-(1->3)-2,4-di-O-benzyl-α-L-rhamnopyranoside