2-Methyl- and 10-methyl-5-cyclodecenone were made by anionic oxy-Cope rearrangement of the corresponding 1,2-divinylcyclohexanols, and their transannular cyclizations were induced using trifluoroacetic acid. In each case, a single diastereomer of a trans fused bicyclo[4.4.0]decan-1-ol with an equatorial methyl group was isolated. The methyl substituent at C2 or C10 of the 5-cyclodecenone did not alter
通过相应的1,2-二
乙烯基环己醇的阴离子氧基-Cope重排制备2-甲基和10-甲基-5-环
癸烯酮,并使用
三氟乙酸诱导它们的跨环环化。在每种情况下,均分离出具有赤道甲基的反式稠合双环[4.4.0]癸癸-1-醇的单一非对映异构体。5-环
癸烯酮的C2或C10处的甲基取代基不会改变以前在母体环系统(E)-5-环
癸烯酮中观察到的区域和立体
化学。由J值分析和NOE通过光谱法确定产物的相对立体
化学。