Polyoxygenated coumarins. Oxonium ylides en route to polyoxa-macrocyclic coumarins
作者:Sergio Cenini、Giancarlo Cravotto、Giovanni B. Giovenzana、Giovanni Palmisano、Stefano Tollari
DOI:10.1016/s0040-4020(99)00291-4
日期:1999.5
The overall sequence of Rh(II)-catalysed carbenoid generation, oxoniumylide formation and subsequent sigmatropic rearrangement utilising 3-diazo-2H-1-benzopyran-2,4(3H)-dione in cyclic ethers as solvents has been satisfactorily used to achieve the synthesis of several medium- to large-membered polyoxa macrocycles embodying the coumarin subunit.
令人满意地使用了Rh(II)催化类胡萝卜素生成,氧鎓叶立德形成以及随后在环醚中使用3-重氮基2 H -1-苯并吡喃-2,4(3 H)-二酮作为溶剂的σ重排的整体顺序。以实现几个体现香豆素亚基的中型至大型成员多氧合大环化合物的合成。