and cis-resorcylides are included, the latter being prepared by photoisomerization of the trans-isomer. β-Haloketone derivatives were also prepared in a highly stereoselective manner by conjugate addition of chloride or bromide to the E-enone using boron trichloride and boron tribromide, respectively.
描述了一种间苯二酸内酯的方法,该方法利用了分子内的烯化反应来生成14元大内酯。合成路线给出了
玉米赤霉烯酮前体,并且包括其他RAL类似物,反式和顺式-
间苯二酚的制备,后者通过反式-异构体的光异构化制备。还通过分别使用
三氯化硼和
三溴化硼将
氯化物或
溴化物共轭加到E-烯酮中,以高度立体选择性的方式制备β-卤代酮衍
生物。