Unprecedented formation of a 14-membered dihydropyran macrocycle via sequential olefin cross metathesis-intramolecular hetero Diels–Alder reaction
作者:Kavirayani R. Prasad、S. Mothish Kumar
DOI:10.1016/j.tet.2013.05.032
日期:2013.8
Formation of a 2,3-dihydro-4H-pyran containing 14-membered macrocycle by sequential olefin cross metathesis and a highly regiospecific hetero Diels–Alder reaction was observed in the reaction of a hydroxydienone derived from tartaric acid with Grubbs' second generation catalyst. It was found that the free alcohol in the hydroxyenone led to the macrocycle formation, while protection of the hydroxy group
通过连续的烯烃交叉复分解和高度区域特异性的杂Diels-Alder反应,形成了由14位元大环组成的2,3-二氢-4 H-吡喃,在由酒石酸衍生的羟基二烯酮与Grubbs的第二代催化剂反应中观察到。发现羟基烯酮中的游离醇导致大环形成,而羟基的保护形成了闭环复分解产物。