An unprecedented functional group assisted CuI‐catalyzed defunctionalization reaction has been developed. The simple strategy can remove the ester with the methylene group (–CH2CO2R) from a large array of N‐pyridinyl pyrrolo esters. In addition to the synthesis, an interesting extensive mechanistic study with evidence on the roles of both CuI and the N‐pyridinyl ring is also reported.
已经开发出前所未有的官能团辅助的Cu I催化的去官能化反应。简单的策略可以从大量N-吡啶基吡咯烷酸酯中除去带有亚甲基的酯(–CH 2 CO 2 R)。除了合成以外,还报道了一项有趣的广泛的机理研究,该研究提供了有关Cu I和N-吡啶基环的作用的证据。
One-pot tandem cyclisation to pyrrolo[1,2-<i>a</i>][1,4]benzodiazepines: a modified approach to the Pictet–Spengler reaction
We have reported a one-pot two-step methodology for the synthesis of highly condensed heterocycles, pyrrolo[1,2-a][1,4]benzodiazepines, by a modified Pictet–Spengler reaction under mild conditions in a short time. Our approach has a few advantages over the conventional two components synthesis as it is step and atom economic, environmentally benign and a convergent synthetic method. We have discussed
我们已经报道了在改良的Pictet-Spengler反应中在短时间内在改良的Pictet-Spengler反应中合成高浓缩杂环,吡咯并[1,2- a ] [1,4]苯并二氮杂物的一锅两步方法。我们的方法相对于常规的两组分合成方法具有一些优势,因为它是一步法和原子经济,对环境有益的方法,并且是一种收敛的合成方法。我们在这里讨论了这种新颖方法的广泛的基质范围。
A novel approach to benz[e]indenes
作者:Nasima Yasmin、Jayanta K. Ray
DOI:10.1016/j.tetlet.2010.07.031
日期:2010.9
A number of benz[e]indene derivatives have been prepared at room temperature in good to excellent yields by treating 3-(2-formyl-cycloalkenyl)-acrylic acid esters with diphosphorus pentasulfide. An azulene derivative was also synthesized by this simple method.
通过用五硫化二磷处理3-(2-甲酰基-环烯基)-丙烯酸酯,在室温下以良好或优异的产率制备了许多苯并[ e ]茚衍生物。还通过该简单方法合成了z并衍生物。
Thiol-mediated tandem Michael–aldol reaction: a convenient method for the synthesis of fused cyclopentenones
作者:Shubhankar Samanta、Nasima Yasmin、Debasish Kundu、Jayanta K. Ray
DOI:10.1016/j.tetlet.2010.05.142
日期:2010.8
A simple, convenient, one-pot synthetic approach towards substituted cyclopentenone derivatives via thiol-mediated tandem Michael–aldol reaction followed by acid-catalyzed thiol elimination and isomerization of 3-(2-formyl-3,4-dihydronapthalene 1-yl)-acrylic acid esters has been developed.
N-substituted pyrrole derivatives and their application to construct macrocyclic oxazocinone via a two-component coupling reaction followed by base mediated intramolecular cyclization. This methodology provides an easy two-step approach to constitute a library of fused pyrrolo-oxazocinone derivatives in good yields under mild reaction conditions. The present methodology offers an easy access to the synthesis
在本文中,我们报道了N-取代的吡咯衍生物的有效合成及其在通过两组分偶联反应,然后通过碱介导的分子内环化反应来构建大环恶唑烷酮中的应用。该方法提供了一种简单的两步法,可以在温和的反应条件下以高收率构建稠合的吡咯并恶唑啉酮衍生物库。本方法提供了容易获得荧光吡咯衍生物文库的合成的途径。其中,叔丁基2-(2-(3-羟丙基)-7-甲氧基-4,5-二氢- 2 H ^ -苯并[ ë] isoindol-1-yl)acetate已用于生物分析成像,显示有效的细胞内化作用,没有明显的细胞毒性。