One-pot synthesis of highly fluorescent polycyclic benzimidazole derivatives
作者:Susanta Kumar Manna、Suresh Kumar Mondal、Atiur Ahmed、Arabinda Mandal、Atanu Jana、Mohammed Ikbal、Shubhankar Samanta、Jayanta K. Ray
DOI:10.1039/c3ra44521f
日期:——
An efficient one pot synthesis of polycyclic benzimidazole derivatives has been developed (up to 90% yield). The protocol is very mild, metal-free, and not restricted to anhydrous conditions. It also demonstrates an example of preferential electrocyclic reaction over Michael reaction. These new benzimidazole derivatives are highlyfluorescent and show a dramatic change with pH; The characteristic bright
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。
Synthesis of phthalides utilizing a one-pot intramolecular domino protocol
作者:Nasima Yasmin、Jayanta K. Ray
DOI:10.1039/c3ra45117h
日期:——
A number of (E)-3-alkylidine-phthalide derivatives have been prepared at room temperature in excellent yields in a one-pot reaction by treating o-alkenylbenzoic acids with meta-chloroperbenzoic acid and para-toluenesulfonic acid. This reaction presumably occurs via domino epoxidation – intramolecular cyclization – acid catalyzed dehydration sequence of reactions. On the other hand, 3-(2-formyl-3,4-dihydro-naphthalen-1-yl)-acrylic acid esters and 3-(2-formyl-3,4-dihydro-naphthalen-1-yl)-acrylonitriles afforded phthalide derivatives under Pinnick reaction conditions involving oxidation-intramolecular Michael addition.
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。