Syntheses and Properties of Enantiomerically Pure Higher (n ≥ 7) [n−2]Triangulanedimethanols and σ-[n]Helicenes
作者:Armin de Meijere、Alexander F. Khlebnikov、Sergei I. Kozhushkov、Dmitrii S. Yufit、Olga V. Chetina、Judith A. K. Howard、Takuya Kurahashi、Kazutoshi Miyazawa、Daniel Frank、Peter R. Schreiner、B. Christopher Rinderspacher、Mari Fujisawa、Chiyo Yamamoto、Yoshio Okamoto
DOI:10.1002/chem.200600111
日期:2006.7.24
lower members (n=4, 5) of the sigma-[n]helicenes. For the higher ones (n=7, 9, 15) the computed specific rotations turn out increasingly larger than the experimental values. The remarkable increase of the specific rotation with an increasing number of three-membered rings is proportional neither to the molecular weight nor to the number of cyclopropane rings in these sigma-[n]helicenes.
(P)-(+)-Hexaspiro [2.0.0.0。0.0.2.1.1.1.1.1]十五烷[(P)-17]以及(M)-(-)-和(P)-(+)-八倍体[2.0.0.0.0.0.0.0.2.1.1.1。 1.1.1.1]从外消旋THP保护的(亚甲基环丙基)甲醇6开始制备[[M]-和(P)-25]对映体纯的直链[7]-和[9]三角烷的壬二烷[6]。所有重要的中间体以及关键中间体的绝对构型均通过X射线晶体结构分析确定。对n = 7、9的对映体纯线性[n]三角烷酮的这种新的收敛方法也已在针对[15]三角烷的两个变体中进行了测试。新制备的化合物的一些最突出和出乎意料的特征是二醇(P)-14,(E)-(3S,3'S,4S,4'S,5R,5'R)-的自组装显着模式21,(P)-(+)-22,和(E)-31处于固态,通过分子间氢键的构架,取决于各自的结构,导致纳米管-[(P)-14,(P)-(+)-22和(E)-31