The title compounds, namely, the chiral acetals and their positional isomers were efficiently prepared by heating 6-bromocyclohepta[b][1,4]benzoxazines and the substituted o-aminophenols at 120 °C in acetic acid.
通过在 120 °C 的乙酸中加热 6-溴环庚 [b][1,4] 苯并恶嗪和取代的邻氨基苯酚,可以有效地制备标题化合物,即手性缩醛及其位置异构体。