5-hydroxy-4-(4-nitrobenzoyloxy)-2,6,6-trimethyl-2-cyclohepten-1-one 、
乙醇 在
乙酸乙酯 、
正己烷 作用下,
以to obtain 0.7 g (64%) of 1-ethoxy-4-(4-nitrobenzoyloxy)-2,6,6-trimethyl-8-oxabicyclo[3.2.1]oct-2-ene (AU246) as light yellow flakes的产率得到1-ethoxy-4-(4-nitrobenzoyloxy)-2,6,6-trimethyl-8-oxabicyclo[3.2.1]oct-2-ene