allyl (1,2-dideoxy-4,5;7,8-di-O-isopropylidene)-α-D-manno-oct-1-eno-3-ulofuranose 在
Grubbs catalyst first generation 作用下,
以
二氯甲烷 为溶剂,
以95%的产率得到(2R,3S,4S,5S)-3,4-dihydroxy-3,4-O-isopropylidene-2-({(R)-1,2-dihydroxy-1,2-O-isopropylidene}ethyl)-1,6-dioxa-spiro[4.4]non-8-ene