Enantioselective Syntheses of Cryptocarya Triacetate, Cryptocaryolone, and Cryptocaryolone Diacetate
作者:Catherine M. Smith、George A. O'Doherty
DOI:10.1021/ol0345529
日期:2003.5.1
products from Cryptocarya latifolia have been achieved in 13-15 steps from ethyl sorbate. The route relies upon an enantio- and regioselective Sharpless dihydroxylation and a palladium-catalyzed reduction to establish the absolute stereochemistry. The route also relies upon a highly (E)-selective olefin cross-metathesis reaction to form trans-delta-hydroxy-1-enoates. The resulting delta-hydroxy-1-enoates were
[反应:见正文]来自山茱rypto的三种天然产物的对映选择性合成是从山梨酸乙酯经过13到15步完成的。该路线依赖于对映体和区域选择性的Sharpless二羟基化反应和钯催化的还原反应,以建立绝对的立体化学。该路线还依赖于高度(E)-选择性的烯烃交叉复分解反应以形成反式-δ-羟基-1-烯酸酯。随后将所得的δ-羟基-1-烯酸酯转化为隐乙酸三乙酸酯,隐caryolone和双隐隐caryolone。