A New Stereocontrolled Synthesis of Dihydroxerulin, a Potent Noncytotoxic Inhibitor of the Biosynthesis of Cholesterol
作者:Renzo Rossi、Fabio Bellina、Antonella Catanese、Luisa Mannina、Daniela Valensin
DOI:10.1016/s0040-4020(99)01030-3
日期:2000.1
Dihydroxerulin, 1, has been stereoselectively synthesized by a convergent approach in which a key step was the Wittig reaction between (Z)-5-[(E)-3-formyl-2-propenylidene]-5H-furan-2-one, 15, and the phosphonium ylid which derived from [(E)-2-decen-4,6-diyn-1-yl]triphenylphosphonium bromide, 19. Compound 19 was conveniently prepared by a short reaction sequence involving a Stille reaction between 1-trimethylstannyl-1
Dihydroxerulin,1,已被立体选择性地由一个会聚的方法,其中一个关键步骤是(之间的Wittig反应ž [( - )-5 Ë)-3-甲酰基-2-亚丙烯基] -5- ħ -呋喃-2-酮,15,和衍生自[(E)-2-decen-4,6-diyn-1-yl]三苯基溴化phosph的磷鎓基吡啶,19。化合物19可通过短反应序列方便地制备,该短反应序列涉及1-三甲基锡烷基-1,3-庚二炔17和18(E)-3-碘-2-丙烯1-ol 18之间的Stille反应。另一方面,化合物15通过八步反应顺序制备丁烯内酯的直接前体,即(Z)-5-[(2 E)-4-羟基-2-丁烯叉] -5 H-呋喃-2-酮,34通过Ag(I)催化的相应的(Z)-2-en-4-炔酸的内酯化在区域和立体上选择性地合成。的结构和立体化学的1被它的基础上建立的1 H和13 C NMR光谱在600和150 MHz的,分别与通过2D NMR技术的组合。