(Z)-3-bromo-1-iodopropene (5), followed by n-BuLi-mediated cyclization of the resultant products 15–19, provides the tertiary allylic alcohols 22–26, which, upon oxidation with a Cr(VI) reagent, afford the cyclopentenones 29–33. The α-methylcyclopentenones 34 and 35 are similarly derived from the keto esters 13 and 14.
底物8–12与(Z)-3-溴-1-
碘丙烯(5)进行烷基化,然后n -BuLi介导的最终产物15–19环化,提供叔烯丙基醇22–26,用Cr(VI)试剂氧化后,可得到
环戊烯酮29–33。α-甲基
环戊烯酮34和35类似地衍生自
酮酯13和14。