Synthesis of Phytuberin. 4-<i>endo-tet</i> Acid-Catalyzed Cyclization of α-Hydroxy Epoxides
作者:Thierry Prangé、María S. Rodríguez、Ernesto Suárez
DOI:10.1021/jo034129d
日期:2003.5.1
The total synthesis of phytuberin, a phytoalexin of the Solanum genus, from (-)-alpha-santonin is reported. The key steps include (a) reductive cleavage of the C-O bond of the gamma-lactone with concomitant protection of the C1 double bond, (b) Sharpless stereocontrolled hydroxy-assisted epoxidation of allylic alcohol 6 and simultaneous deprotection of the C1 double bond, (c) a rare 4-endo-tet acid-catalyzed
据报道,从(-)-α-桑顿蛋白中总合成出植物素(一种茄属植物的植物抗毒素)。关键步骤包括(a)γ-内酯的CO键被还原性裂解并伴有C1双键的保护;(b)烯丙醇6的锐利的立体控制羟基辅助环氧化和C1双键的同时脱保护,( c)罕见的4-内-tet酸催化的α-羟基环氧化物的环化反应,和(d)前所未有的4-烯丙基醇的4-exo硒代环化反应。