The synthesis of
(+)-(S)-1′,4-dihydroxy-2,3′-dimethyl-1,2′-binaphthalene-5,5′,8,8′-tetrone
(62) and
(+)-(S)-4,5′,8′-trihydroxy-2,3′-dimethyl-1,2′-binaphthalene-1′,4′,5,8-tetrone
(55), compounds which are atrop-isomeric with the naturally occurring
binaphthoquinones (–)-isodiospyrin and
(–)-8′-hydroxyisodiospyrin, respectively, is described. The
binaphthyl linkages in these compounds were stereoselectively constructed by
using oxazoline chemistry. The stereochemical assignments were based on X-ray
crystal structure determination and circular dichroic spectroscopy.
合成
(+)-(S)-1′,4-二羟基-2,3′-二甲基-1,2′-萘-5,5′,8,8′-四酮(62)的合成
(62)和
(+)-(S)-4,5′,8′-三羟基-2,3′-二甲基-1,2′-萘-1′,4′,5,8-四酮(55)。
(55),这些化合物与天然存在的
(-)-isodiospyrin 和
(-)-8′-hydroxyisodiospyrin 的异构体。这些
中的二萘基连接是通过噁唑啉化学方法立体选择性地构建的。
使用噁唑啉化学方法立体选择性地构建了这些化合物中的二萘基连接。立体化学分配基于 X 射线
晶体结构测定和圆二色光谱测定。