design and synthesis of stable 1,2-dithietane derivatives for the generation of diatomicsulfur (S 2 ) was undertaken. Computer-aided evaluation of enthalpic differences was used to direct the synthesis of target compounds and, although all of the compounds calculated to afford S 2 that were prepared did yield diatomicsulfur, an isolable 1,2-dithietane other than dithiatopazine failed to materialize
对用于生成双原子硫 (S 2 ) 的稳定 1,2-二硫杂环丁烷衍生物的设计和合成进行了详细研究。焓差的计算机辅助评估用于指导目标化合物的合成,尽管计算出的所有化合物均能提供所制备的 S 2 确实产生了双原子硫,但除二硫托嗪之外的可分离 1,2-二硫杂环丁烷未能实现
A Chiral Relay Race: Stereoselective Synthesis of Axially Chiral Biaryl Diketones through Ring-Opening of Optical Dihydrophenan-threne-9,10-diols
作者:Lei Shi、Jiawei Zhu、Biqiong Hong、Zhenhua Gu
DOI:10.3390/molecules28165956
日期:——
point-to-axial chirality transfer reaction of optical dihydrophenanthrene-9,10-diols for the synthesis of axiallychiral diketones. Two sets of conditions, namely a basic tBuOK/air atmosphere and an acidic NaClO/n-Bu4NHSO4, were developed to oxidatively cleave the C-C bond, resulting in the formation of axiallychiralbiaryl diketones. Finally, brief synthetic applications of the obtained chiral aryl diketones
我们在此报道了光学二氢菲-9,10-二醇的点到轴手性转移反应,用于合成轴向手性二酮。开发了两组条件,即碱性 tBuOK/空气气氛和酸性 NaClO/n-Bu4NHSO4,以氧化裂解 CC 键,从而形成轴向手性联芳基二酮。最后,展示了所得手性芳基二酮的简要合成应用。
Enantioselective Synthesis of α-Benzylalanine Using trans-3,4-Dihydro-3,4-diaryldibenzo[c,g]phenanthrene-3,4-diols
Asymmetric benzylation of a benzophenone Schiff’s base of alanine ethyl ester was successfully conducted using trans-3,4-dihydro-3,4-diaryldibenzo[c,g]phenanthrene-3,4-diol as a chiral source.
Pinacol coupling of 2,2′-biaryldiketone gave trans-diol selectively. In the reaction of axially chiral diketones, enantiomerically pure diols were obtained. Various enantiopure 3,4-dihydrodibenzo[c,g]phenanthrene-3,4-diol could be synthesized by the pinacol coupling of optically active 2,2′-diacyl-1,1′-binaphthalene derived from (P)-1,1′-bi-2-naphthol [(S)-BINOL].