In a ring-expansion reaction, alkyl and aryl nitriles, in the presence of tetrafluoroboric acid-diethyl ether complex, react with 3-methoxy-16β,17β-dihydro-4'H-oxeto[3',2':16,17]estra-1,3,5(10)-triene to give 3-methoxy-16β,17β-dihydro-4'H-[1,3]-oxazino[5',6':16,17]estra-1,3,5(10)-triene derivatives. Under similar conditions 3-methoxy-16α,17α-dihydro-4'H-oxeto[3',2':16,17]estra-1,3,5(10)-triene undergoes a Wagner-Meerwein rearrangement.
在一个环扩张反应中,烷基和芳基腈在四
氟硼酸二
乙醚络合物存在下,与3-甲氧基-16β,17β-二氢-4'
H-氧
蒽并[3',2':16,17]雌
三烯反应,生成3-甲氧基-16β,17β-二氢-4'
H-[1,3]-
噁唑啉[5',6':16,17]雌
三烯衍
生物。在类似条件下,3-甲氧基-16α,17α-二氢-4'
H-氧
蒽并[3',2':16,17]雌
三烯会发生瓦格纳-梅尔文重排反应。