Enantiocontrolled synthesis of the epoxycyclohexenone moieties of scyphostatin, a potent and specific inhibitor of neutral sphingomyelinase
作者:Tadashi Katoh、Takashi Izuhara、Wakako Yokota、Munenori Inoue、Kazuhiro Watanabe、Ayaka Nobeyama、Takeyuki Suzuki
DOI:10.1016/j.tet.2005.10.082
日期:2006.2
The epoxycyclohexenone moieties 2 and 3b of scyphostatin (1), a potent and specific inhibitor of neutral sphingomyelinase, were synthesized in enantiomerically pure forms starting from (−)-quinic acid (11). The synthetic method features (i) the preparation of the olefin masked enones 25 and 29, the precursors for the key aldol-type coupling reaction, (ii) the efficient and stereocontrolled aldol-type
鞘脂抑素(1)的环氧环己烯酮部分2和3b(一种有效的中性鞘磷脂酶抑制剂)以对映体纯净的形式从(-)-奎宁酸(11)合成。合成方法的特征是(i)制备烯烃掩蔽的烯酮25和29,关键的醇醛型偶联反应的前体,(ii)25(或29)与苯甲醛之间有效且立体控制的醇醛型偶联反应(8)和加纳的醛类似物9传递醇23和24,分别在C6位置具有必需的不对称季碳中心,以及(iii)甲磺酸盐35和47在温和的碱性条件下形成立体定向的S N 2型环氧化物环,以生成目标化合物2和3b, 分别。