Base-mediated cyclocondensation of 2-hydroxybenzaldehydes with 3-bromo-1-(arylsulfonyl)propenes and 4-bromocrotonates afforded (E)-2-(2-sulfonylvinyl)benzofurans and (E)-2-benzofuranyl-3-acrylates respectively.
2-羟基
苯甲醛与3-溴-1-(芳基磺酰基)
丙烯和
4-溴巴豆酸酯的碱介导的环缩合分别得到(E)-2-(2-磺酰基
乙烯基)
苯并呋喃和(E)-2-
苯并呋喃基-3-
丙烯酸酯。