(5R)-5-O-methyl-1,2-O-(1-methylethylidene)-3-O-allyl-5-C-allyl-α-D-xylofuranose 在
titanium(IV) isopropylate 、
Grubbs catalyst first generation 作用下,
以
二氯甲烷 为溶剂,
以68%的产率得到9-methoxy-2,2-dimethyl-3a,5,8,9,9a,10a-hexahydro-3bH-1,3,4,10-tetraoxacycloocta[a]pentalene