[S]-(+)-2-acetyl-7-(2,3-epoxypropoxy)benzofuran (SEBF) is prepared by subjecting 2-acetyl-7-hydroxybenzofuran and [R]-glycidol to dehydration condensation in an inert organic solvent in the presence of triphenylphosphine and a dialkyl azodicarboxylate. The [S]-(+)-2-actyl-7-(2,3-epoxypropoxy) benzofuran can be easily converted into [S]-2-acetyl-7-(2-hydroxy-3-isopropylaminopropoxy) benzofuran ([S]-befunolol) or salts thereof which are useful as a β-adrenergic blocking agent, by reacting it with isopropylamine.
[S]-(+)-2-乙酰基-7-(2,3-环氧丙氧基)
苯并呋喃(
SEBF)是在
三苯基膦和偶氮二
甲酸二烷基酯存在下,通过在惰性有机溶剂中使 2-乙酰基-
7-羟基苯并呋喃和[R]-
缩水甘油脱
水缩合而制备的。通过与
异丙胺反应,[S]-(+)-2-乙酰基-7-(2,3-环氧丙氧基)
苯并呋喃可以很容易地转化为[S]-2-乙酰基-7-(2-羟基-3-异丙基
氨基丙氧基)
苯并呋喃([S]-倍福洛)或其盐,后者可用作β-
肾上腺素能阻断剂。