The synthesis of 3-hydroxymethylfuro[3,2-b]naphtho[2,3-d]furan-5,10-dione, a novel metabolite isolated from Crescentia cujete
作者:Linda B. Nielsen、Riskiono Slamet、Dieter Wege
DOI:10.1016/j.tet.2009.03.091
日期:2009.6
steps involve a tandem intramolecular Diels–Alder/reverse Diels–Alder reaction sequence. Thus 3-(2-furyl)-1,4-dimethoxynaphthalen-2-ol was treated with ethyl 3-bromopropiolate, and without isolation, the resulting acetylenic ether was heated in the presence of 3,6-di(pyridin-2-yl)-1,2,4,5-tetrazine. Intramolecular addition of the pendant acetylenic chain to the furan ring followed by cycloaddition of
具有一个新的环骨架的标题天然产物1已通过序列合成,其中关键步骤涉及串联分子内Diels–Alder /反向Diels–Alder反应序列。因此,将3-(2-呋喃基)-1,4-二甲氧基萘-2-醇用3-溴丙酸乙酯处理,并且不分离,将得到的炔属醚在3,6-二(吡啶-2-基)存在下加热。 yl)-1,2,4,5-四嗪。将侧链炔链分子内加到呋喃环中,然后环加电子缺陷的四嗪并随后环还原,得到5,10-二甲氧基呋喃[3,2- b ]萘[2,3 - d ]呋喃-3-羧酸乙酯,其具有天然产物的环系统。然后提供了功能组操纵1。