TiCl<sub>4</sub>-<i>n</i>-Bu<sub>3</sub>N-mediated cascade annulation of ketones with α-ketoesters: a facile synthesis of highly substituted fused γ-alkylidene-butenolides
作者:Megha N. Palange、Rajesh G. Gonnade、Ravindar Kontham
DOI:10.1039/c9ob00649d
日期:——
to biologically relevant natural products were prepared from readily accessible ketone and α-ketoester building blocks. The highly step-economic cascade nature, good substrate scope, easy access to complex products with good to excellent yields, gram-scalability, demonstration of synthetic utility, and unambiguous structural confirmation through X-ray crystallography analyses and analogy are the salient
据报道,使用酮与α-酮酸酯的直接环合反应来合成高度取代的稠合γ-亚烷基丁烯化物的简便方法是通过TiCl4-n-Bu3N介导的羟醛加成,然后进行分子内烯醇-内酯化/环化级联反应进行的。从易于获得的酮和α-酮酸酯结构单元中制备与生物相关天然产物有关的6-5、7-5和8-5稠合的双环γ-亚烷基丁烯化物和高度取代的单环类似物。该产品的显着特点是高度阶梯经济的级联性质,良好的底物范围,容易获得具有优良至优异收率的复杂产品,克可缩放性,证明了合成效用以及通过X射线晶体学分析和类似物明确的结构确认。工作。