2,2-Dimethyl-propionic acid (1R,6R)-6-(2,2-dimethyl-propionyloxy)-2,5-dioxo-cyclohex-3-enyl ester 、
环戊二烯 反应 4.0h,
以71%的产率得到2,2-Dimethyl-propionic acid (1S,4R,4aS,6R,7R,8aR)-7-(2,2-dimethyl-propionyloxy)-5,8-dioxo-1,4,4a,5,6,7,8,8a-octahydro-1,4-methano-naphthalen-6-yl ester