action of hypervalent iodine reagents. The reagent, (diacetoxyiodo)benzene (‘DIB’) is especially effective in these transformations. This paper focuses on techniques for the desymmetrization of the dienoes thus obtained, leading to the stereocontrolled creation of N-substituted spiro carbons. The methodology creates new opportunities in alkaloid synthesis, as apparent from a number of examples.
酚的
氧化
酰胺化作用是通过高价
碘试剂的作用,将适当取代的
酚转化为4-
酰胺二
烯酮(“对-
氧化
酰胺化”)或2-
酰胺二
烯酮(“邻-
氧化
酰胺化”)。(
二乙酰氧基
碘)
苯试剂('DIB')在这些转化中特别有效。本文着重于对由此获得的二
烯进行去对称化的技术,从而导致了N-取代螺
碳的立体控制生成。从许多例子中可以明显看出,该方法为
生物碱合成创造了新的机会。