of spirocyclic quaternary centres may be achieved by hydroxy-directed Simmons–Smith cyclopropanation of an allylic alcohol followed by a tandem free radical cyclopropylcarbinyl rearrangement–cyclisation reaction; generation of the spiro-fused systems is subject to stereoelectronic and kinetic control.
可以通过羟基指导的烯丙基醇的席梦斯-史密斯
环丙烷化,然后进行串联自由基环丙基羰基重排-环化反应,来实现螺环四级中心的区域和立体特异性构建。螺线融合系统的产生要经过立体电子和动力学控制。