vindoline and its deacetyl derivative yield the cathovaline like compounds and , respectively, and the furanic diastereoisomers and . Fluoro derivatives rearrange in superacids to (92%), (60%) and to lactone (58%), respectively, whereas the (20R) analogs are completely unreactive. This last result can be accounted for by intervening of a reactive conformation of the fluoroethyl group in the (20S) series
在0 °C的HF-SbF 5中,
长春花碱及其脱乙酰基衍
生物分别产生类似cathovaline的化合物和,以及
呋喃非对映异构体和。含
氟衍
生物在超强酸中的重排分别为(92%),(60%)和内酯(58%),而(20 R)类似物则完全没有反应性。可以通过干预(20 S)系列中
氟乙基的反应性构象来解释这一最后结果,由于空间原因,(20 R)系列中的相应
氟乙基是不利的。