Electrophile-Induced Ether Transfer: Stereoselective Synthesis of 2,6-Disubstituted-3,4-Dihydropyrans
作者:Rendy Kartika、Jeffrey D. Frein、Richard E. Taylor
DOI:10.1021/jo800704d
日期:2008.7.1
Stereoselectivesynthesis of trans-2,6-disubstituted-3,4-dihydropyrans has been achieved from a simple homoallylic alkoxyether via a three-step sequence: electrophile-induced ether transfer, cyclization, and functionalization, which is highlighted by a rare example of Ferrier rearrangement of allylic ether. This methodology was successfully implemented for the asymmetric synthesis of a C7−C17 fragment
comprehensive total synthesis of scytophycins, we have investigated the late-state functionalization using fragment compounds. We established stereoselective construction of the C7-C21 part in scytophycins A and B involving characteristic C16 epoxide by using Sharpless epoxidation. Although stereoselectivity remains unsatisfactory, reduction of the C16 exo-olefin for the synthesis of scytophycin C was
Scytophysins 是具有 22 元环的细胞毒性大环内酯,其特点是针对细胞骨架蛋白肌动蛋白具有很强的细胞毒性。为了全面合成胞藻素,我们研究了使用片段化合物的后期功能化。我们通过使用 Sharpless 环氧化建立了涉及特征 C16 环氧化物的 scytophycins A 和 B 中 C7-C21 部分的立体选择性结构。尽管立体选择性仍然不令人满意,但实现了用于合成胞藻素 C 的 C16外烯烃的还原。