Heating a variety of 2-hydroxybenzyl acetates bearing a range functional groups on the 4- or 5-position of the aromatic ring at 100 ËC in neat γ-methylene-γ-butyrolactone (1.0 M) for 20 hours gives a series of benzannelated [5,6]-spiroketals in 75-89% yield.
将芳香环 4 位或 5 位上带有一系列官能团的各种 2-羟基
苄基乙酸酯在 100 ℃、纯净的 δ³-亚甲基-δ³
-丁内酯(1.0 M)中加热 20 小时,可得到一系列苯通道化的 [5,6]-螺酮,收率为 75-89%。