Bottom-Up Synthesis of Optically Active Oligonaphthalenes: Three Different Pathways for Controlling Axial Chirality<sup>1</sup>
作者:Kazunori Tsubaki、Hiroyuki Tanaka、Kazuto Takaishi、Masaya Miura、Hiroshi Morikawa、Takumi Furuta、Kiyoshi Tanaka、Kaoru Fuji、Takahiro Sasamori、Norihiro Tokitoh、Takeo Kawabata
DOI:10.1021/jo060974v
日期:2006.8.1
configuration of the newly formed axial bond was determined by (1) X-ray crystallographic analysis, (2) transformation to known compounds 15 and 16, (3) CD spectra of oligonaphthalenes with two pyrene rings as exciton parts, and (4) the shift values in 13C NMR spectra of 13C-enriched derivatives 29−31 toward chiral shift reagent Eu(+tfc)3.
光学活性双萘1a - d与化学计量的CuCl 2和胺的氧化均偶联提供了高达93%de的季萘2a - d。高非对映选择性是通过三种不同的途径实现的(轴的尖峰化以及非对映选择性结晶,热力学和动力学控制途径)。萘侧链的类型影响哪个途径占主导。三种途径适用于辛二烯(8a - d)和十六萘(10a)与46-99%的de。新形成的轴向键的绝对构型是通过(1)X射线晶体学分析,(2)转化为已知化合物15和16,(3)以两个pyr环作为激子部分的低碳萘的CD光谱和(4)确定的)在移位值13的C NMR谱13 C-富集的衍生物29 - 31朝向手性位移试剂Eu(+ TFC)3。