Ethyl 5-tert-butyl-2-[4-tert-butyl-2-ethoxycarbonyl-6-(2-hydroxypropan-2-yl)phenyl]sulfonyl-3-(2-hydroxypropan-2-yl)benzoate 在
仲丁基锂 、
碘甲烷 作用下,
以
乙醚 、
环己烷 为溶剂,
以80%的产率得到3,9-Di-tert-butyl-11-(1-hydroxy-1-methyl-ethyl)-5,5-dimethyl-7,12,12-trioxo-7,12-dihydro-5H-6-oxa-12λ
6-thia-dibenzo[a,d]cyclooctene-1-carboxylic acid ethyl ester