2-bromo-3-[[[(1,1-dimethylethyl)diphenylsilyl]oxy]methyl]-4,4-dimethoxy-6-(2-propenyl)-2,5-cyclohexadien-1-one

8-Bromo-7-(tert-butyl-diphenyl-silanyloxymethyl)-10-(2-hydroxy-ethyl)-1,5-dioxa-spiro[5.5]undeca-7,10-dien-9-one

(1S,6R)-4-bromo-3-(((tert-butyldiphenylsilyl)oxy)methyl)-6-(2-hydroxyethyl)-7-oxaspiro[bicyclo[4.1.0]heptane-2,2'-[1,3]dioxan]-3-en-5-one

(1S,4'R,6R,6'R)-6-allyl-4-bromo-3-(((tert-butyldiphenylsilyl)oxy)methyl)-4',6'-dimethyl-7-oxaspiro[bicyclo[4.1.0]heptane-2,2'-[1,3]dioxan]-3-en-5-one

tert-butyl (E)-4-((1S,4'R,6R,6'R)-4-bromo-3-(((tert-butyldiphenylsilyl)oxy)methyl)-4',6'-dimethyl-5-oxo-7-oxaspiro[bicyclo[4.1.0]heptane-2,2'-[1,3]dioxan]-3-en-6-yl)-2-methylbut-2-enoate