Extension of a One-Pot Synthesis of Bicyclo[n.4.0]alkanols; Indications of Scope and Limitations for Formation of Substituted Bicyclo[n.4.0]alkanols
作者:Wendy Loughlin、Michelle McCleary
DOI:10.1055/s-2005-861830
日期:——
ketone was hindered (camphor), and where conjugation was present in the enolate. By contrast, another functional group, as illustrated with 1,4-cyclohexanedione mono-ethylene ketal 24, can be incorporated in the bi-cyclo[4.2.0]octan-1-ol, and the ketal group converted to a ketone, as in 28, without disrupting the bicyclo[4.2.0]octan-l-ol ring.
获得了新型双环[n.2.0]alkan-1-ols,在六元环的C6桥头和C2位置加入甲基取代,在五元环的C2位置加入甲基取代。在这些位置存在或不存在基团对观察到的主要立体化学异构体的偏好有影响。当酮受阻(樟脑)和烯醇化物中存在共轭时,观察到环化方法的潜在局限性。相比之下,另一个官能团,如 1,4-环己二酮单乙烯缩酮 24 所示,可以结合到双环[4.2.0]octan-1-ol 中,缩酮基团转化为酮,如在 28 中,不破坏双环[4.2.0]辛-l-醇环。