作者:Gonzalo Blay、Victoria Bargues、Luz Cardona、Ana M. Collado、Begoña García、Muñoz、José R. Pedro
DOI:10.1021/jo991756n
日期:2000.4.1
derivative 7, stereoselective hydrogenation on Pd/C, reduction, regioselective elimination, hydrolysis, and lactonization. The synthesis of the natural guaianolides 3-5 was carried out in two sequences in which the regioselective elimination of a hydroxyl group at C10 with triflic anhydride or SOCl2 to afford, respectively, the endo or exo double bond on C10 and the regioselective opening of the C3-C4
容易从桑顿宁(1)中获得的羟酸酯2已转化为10α-羟基guai-3-en-8,12-olide 6,这是合成天然8,12-guaianolides的良好中间体。通过对其乙酰基衍生物7进行光化学重排,从2中获得化合物6,在Pd / C上进行立体选择性氢化,还原,区域选择性消除,水解和内酯化。天然愈创木酚内酯3-5的合成按两个顺序进行,其中用三氟甲磺酸酐或SOCl2选择性排斥C10处的羟基,以分别提供C10的内或外双键以及该化合物的区域选择性开口。 C3-C4α-环氧化物是关键步骤。