A stereoselective synthesis of highly substituted and enantiopure tetrahydropyrans from chiral 7-hydroxy-2-alkenoic imides and esters is described. Depending on the carboxylic acid derivative the base-induced cyclization is kinetically or thermodynamically controlled to deliver either tetrahydropyran stereoisomer selectively.
介绍了一种从手性 7-hydroxy-2-alkenoic imides 和
酯类出发,立体选择性合成高取代度和对映体纯度
四氢吡喃的方法。根据
羧酸衍
生物的不同,碱诱导的环化可通过动力学或热力学控制,选择性地生成
四氢吡喃立体异构体。