dimethyl (R,E)-2-(4-acetoxy-4-(tert-butyldimethylsilyl)but-2-en-1-yl)-2-allylmalonate

dimethyl (R,E)-3-(2-(tert-butyldimethylsilyl)vinyl)-4-methylenecyclopentane-1,1-dicarboxylate

dimethyl (4R)-4-((E)-2-(tert-butyldimethylsilyl)vinyl)-3-hydroxy-3-(hydroxymethyl)cyclopentane-1,1-dicarboxylate

dimethyl (4R)-3-hydroxy-3-(hydroxymethyl)-4-vinylcyclopentane-1,1-dicarboxylate

dimethyl (E)-2-(4-(tert-butyldimethylsilyl)-4-oxobut-2-en-1-yl)malonate