Disclosed are an intermediate of Eribulin and a preparation method therefor. In particular, disclosed are compounds as represented by formula II, formula III and formula V and a preparation method therefor. Ar is C
1-10
alkyl substituted, alkyloxy substituted or unsubstituted aryl; R
1
and R
2
is an acetal protecting group or a thioacetal protecting group; R
3
is hydrogen or a hydroxyl protecting group; and X is halogen or a leaving group. The preparation method therefor has the advantages of mild reaction conditions, high selectivity, easy purification, low synthesis cost and the like, being suitable for large scale production.
                            本发明涉及厄利布林中间体及其制备方法。具体地,本发明涉及由公式II、公式III和公式V表示的化合物及其制备方法。其中,Ar是C1-10烷基取代、烷氧基取代或未取代芳基;R1和R2是
缩醛保护基或
硫缩醛保护基;R3是氢或羟基保护基;X是卤素或离去基。该制备方法具有反应条件温和、选择性高、易于纯化、合成成本低等优点,适用于大规模生产。