triethyloxonium fluoroborate 、 (2aRS,3aSR)-3a,4,5,6a-tetrahydrofuro[2,3-b]furan 、
tert-butyl(2-methoxy-1-ethynyl)dimethylsilane 、 alkaline earth salt of/the/ methylsulfuric acid 生成 、 (3aRS,7aSR,3bSR,6aRS)-5-(tert-butyldimethylsilanyl)-6-ethoxy-2,3,3a,3b,6a,7a-hexahydrocyclopenta[b]furo[3,2-d]furan-4-one 、
(3aRS,8aSR)-5-(tert-butyl-dimethylsilanyl)-7-ethoxy-6-methoxy-2,3,3a,8a-tetrahydro-1,8-dioxacyclopenta[a]inden-4-ol