Tetrahydrospiro[1,3-dioxolane-2,1′-pentalen]-4′-ones were stereoselectively converted to either (cis,anti,cis)- or (cis,syn)-linear dodecahydrocyclopenta[a]indene isomers employing a 1,4- or 1,2-conjugate addition of organometallic reagents and an intramolecular aldol reaction as the key steps. The relative configuration of the products was determined by X-ray crystal structure analysis and 1D NOE
将四氢螺[
1,3-二氧戊环-2,1'-
戊烯] -4'-立体选择性地转化为(顺式,反式,顺式)-或(顺式,顺式)线性十二氢环戊五烯[ a ]
茚异构体,采用1关键步骤包括有机
金属试剂的1,4-或1,2-共轭加成和分子内羟醛反应。通过X射线晶体结构分析和一维NOE光谱确定产物的相对构型。