Single enantiomers of 1,8-di(1-adamantyl)naphthalenes were synthesized by the [4+2]cycloaddition reaction of 6-adamantylbenzyne and 2-adamantylfuran. The enantiomers were resolved by conversion into diastereomeric ketopinic acid esters. The absolute configuration was determined by X-ray analysis. Kinetic studies by CD revealed an enantiomerization barrier of 29 kcal mol−1 for 1,8-(1-adamantyl)naphthalenes.
通过 6-adamantylbenzyne 和 2-adamantylfuran 的 [4+2]cycloaddition 反应合成了 1,8-di(1-adamantyl)naphthalenes 的单一对映体。对映体通过转化为非对映的酮酸酯而得以分离。通过 X 射线分析确定了绝对构型。通过 CD 进行的动力学研究显示,1,8-(1-金刚烷基)萘的对映体化障碍为 29 kcal mol-1。