Hydroxylation of 6-substituted 2,7-dioxabicyclo[3.2.0]hept-3-enes (I, XIV and XV) with m-chloroperoxybenzoic acid occurs mainly from the exo side and leads to the corresponding 3-m-chlorobenzoates of trans-3,4-diols (VI, XVIII and XXII). Hydroxylation of substrates XIV and XV with potassium permanganate leads to 3-deoxy-3-C-formyl-DL-arabino-aldofuranoses. Epimerization at the formyl group-bearing carbon atom occurs during the reorganization of dihydroxylated dioxabicycloheptanes in basic medium.
对6-取代的2,7-二氧杂双环[3.2.0]庚-3-烯(I、XIV和XV)进行羟基化反应,主要发生在外侧,并形成相应的
3-氯苯甲酸m-
氯苯酯(VI、XVIII和XXII)。使用
高锰酸钾对底物XIV和XV进行羟基化反应,得到3-去氧-3-C-甲酰-DL-阿拉伯-醛糖。在碱性介质中,二羟基化二氧杂双
环庚烷的重排过程中,甲酰基碳原子上的对映异构化发生。