Methyl-4,6-O-benzyliden-2-deoxy-2-methyl-α-D-altropyranosid 、 alkaline earth salt of/the/ methylsulfuric acid 在
sodium hydride 作用下,
以85%的产率得到(4aR,6S,7S,8S,8aS)-6-methoxy-7-methyl-2-phenyl-8-phenylmethoxy-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxine