The synthesis of a new enantiomerically pure diene, (S)-(+)-1 is reported. The absoluteconfiguration of 1 was determined by non-empirical analysis of its CD spectrum. The synthesis and resolution of the racemic β-diketone 4 into its constituent enantiomers by the SAMP–hydrazone method is described. The enantiopure β-diketone (S)-(+)-4 was then converted to diene (S)-(+)-1 by a two-stage reaction sequence
报道了新的对映体纯的二烯(S)-(+)- 1的合成。的绝对构型1是由它的CD光谱的非经验分析确定的。描述了通过SAMP-hydr方法将外消旋β-二酮4合成并拆分为其组成对映体。然后通过两步反应序列将对映体纯的β-二酮(S)-(+)- 4转化为二烯(S)-(+)- 1。还介绍了通过1 H和13 C NMR光谱对产物进行的结构分析。
Photochemical synthesis of [2.2](3,8)-pyridazinophane and quinolinophane-2(1H)-one as well as synthesis of [2](5,8)-quinolinophanes and fused spiro-pyranoindanoparacyclophanes
作者:Ashraf A. Aly
DOI:10.1016/s0040-4020(03)00112-1
日期:2003.3
their successful synthesis depends on the photochemical synthesis of pyridazinophane and quinolinophane-2(1H)-one from freshly prepared 4-([2.2]paracyclophanyl)-azo-4′-[2.2]paracyclophane and 4-([2.2]paracyclophanyl)cinnnamanilide, respectively. Reactions of 4-amino-[2.2]paracyclophane with either acetyl- or benzoylacetone afforded condensed products. Then ring closure using polyphosphoric acid (PPA)
Both the development of optically pure chiral indenyl rhodium(IndxRh) catalysts and IndxRh-catalyzed asymmetric C−H activation are challenging and seldom reported. Herein, a class of chiral indenyl ligands bearing a [2.2]benzoindenophane skeleton is presented. It is convenient to synthesize and easy to modify (13 variations are shown). Importantly, its coordination to rhodium is face-specific. Moreover
光学纯手性茚基铑(Ind x Rh)催化剂的开发和Ind x Rh催化的不对称C−H活化都具有挑战性且很少报道。本文提出了一类带有[2.2]苯并茚并烷骨架的手性茚基配体。它合成方便,易于修改(显示了 13 种变体)。重要的是,它与铑的配位是针对特定面的。此外,其 Ind x Rh 催化剂的实用性已通过两个不对称 C−H 活化反应得到证明。
Triple self-condensation of fused cycloalkanonylparacyclophanes promoted by titanium tetrachloride and triethylamine
作者:Ashraf A. Aly
DOI:10.1016/j.tetlet.2004.11.100
日期:2005.1
The triple self-condensation of [2](4,7)indano[2]paracyclophan-5-one and 5-oxo-4,5,6,7-tetrahydro[2]parayclo[2]-(1,4)naphthalenophane, as representative examples of fused cycloalkanonylparacyclophanes, promoted by titanium tetrachloride and triethylamine is here reported. (C) 2004 Elsevier Ltd. All rights reserved.