Spiro-acetals (17) and (21) have been synthesized from methyl α-D-glucopyranoside (11), via the 6-chloro-4,6-dideoxygalactopyranoside (10), the epoxy-dithiane (8), and the open-chain dithianes (16) and (20).
螺
缩醛(17)和(21)是由甲基α-
D-吡喃葡萄糖苷(11)通过6-
氯-4,6-二脱氧半
乳糖吡喃糖苷(10),环氧-二
噻吩胺(8)和开环化合物合成的-链二噻烷(16)和(20)。