Approaches to 1<i>H</i>-Cyclopropa[<i>l</i>]phenanthrenes. Eliminations with 1a,9b-Dihydro-1<i>H</i>-cyclopropa[<i>l</i>]phenanthrene Derivatives
作者:Paul Müller、Huong Can Nguyen Thi、Jean Pfyffer
DOI:10.1002/hlca.19860690412
日期:1986.6.18
Base-induced elimination of the sulfonium salt 2i in the presence of furan affords the addition products 7 and 8, derived from 1H-cyclopropa[l]phenanthrene (1) and the isomeric cyclopropene 5a(Scheme 3). Upon oxidation, the selenide 2c yields phenanthrene-9-methanol (9), presumably via1. No evidence for the intermediate 1 is obtained from sulfoxide pyrolysis with 2e, which leads to products formed
Synthesis of <i>trans</i>-stilbenes <i>via</i> phosphine-catalyzed coupling reactions of benzylic halides
作者:Sheng Zhang、Zhilong Xie、Zhanqiang Ye、Mingyang Zhang、Dongdeng Li、Masahiko Yamaguchi、Ming Bao
DOI:10.1039/d2ob01237e
日期:——
are also generated from the reactions of benzyl chlorides with phosphoniumsalts. Several P-based key intermediates have been detected by NMR and HRMS analyses, which shed light on the postulated catalytic cycle. In the presence of different bases, the transformations involve two different pathways, in which phenylcarbene and phosphonium alkoxide are considered as key intermediates, respectively. The
描述了一种高效实用的膦催化氯化苄的均偶联反应。在 CsF/B(OMe) 3和 NaH 作为碱的存在下,反应顺利进行,分别提供反式-二苯乙烯产量高,范围广。苄基氯与鏻盐的反应也产生不对称二苯乙烯。通过 NMR 和 HRMS 分析检测到几种 P 基关键中间体,这揭示了假定的催化循环。在不同碱基存在下,转化涉及两种不同的途径,其中苯卡宾和醇鏻分别被认为是关键中间体。这两种途径在合成上互补,但在机制上不同。合成效用,包括克级反应和直接获得 π 共轭分子,也已得到证明。
Sugimoto, Akira; Kimoto, Satoshi; Inoue, Hiroo, Journal of Chemical Research - Part S, 1996, # 11, p. 506 - 507
作者:Sugimoto, Akira、Kimoto, Satoshi、Inoue, Hiroo
DOI:——
日期:——
Burgstahler,A.W. et al., Journal of the Chemical Society, 1963, p. 4986 - 4989
作者:Burgstahler,A.W. et al.
DOI:——
日期:——
9-Vinylphenanthrenes. IV. Di- and Tetraphenanthrylethylenes