作者:Estelle Marchal、Philippe Uriac、Béatrice Legouin、Loïc Toupet、Pierre van de Weghe
DOI:10.1016/j.tet.2007.07.066
日期:2007.10
We have developed a gold(I)-catalyzed intramolecular cyclization of γ- and δ-alkyne acids in mild conditions yielding various alkylidene lactones. Whereas a slight electronic effect of the R group was observed on the regioselectivity, bulky substituents on the R group bearing the alkyne strongly modify the reactivity. The cycloisomerization of o-alkynylbenzoic methyl esters was achieved rather with
我们已经开发了在温和条件下金(I)催化的γ-和δ-炔酸分子内环化反应,生成各种亚烷基内酯。尽管观察到R基团对区域选择性有轻微的电子作用,但带有炔烃的R基团上的大取代基强烈地改变了反应性。由于存在水而仅提供异香豆素,所以用AuCl 3作为催化剂而不是AuCl 3可以实现邻炔基苯甲酸甲酯的环异构化。