undecose ring structure of herbicidins has been prepared. The synthesis of this novel furanosyl‐pyranone derivative was made possible through the regioselective reductive ring‐opening of a 3,5‐O‐benzylidene‐D‐xylofuranose and the hetero‐Diels—Alder reaction of an aldehyde and a Danishefsky‐type diene. The highly functionalized pyranone derivative can be a useful precursor for the synthesis of herbicidins
已经制备了与
除草剂的十一碳环结构无结构相关的新化合物。这种新颖的
呋喃糖基
吡喃酮衍
生物的合成是通过一个3,5-区域选择性还原开环成为可能ø -亚苄基- d
呋喃木糖和醛和Danishefsky型二烯的杂Diels-Alder反应。高度官能化的
吡喃酮衍
生物可以是合成除草素的有用前体。