An Improved One-Pot Method for the Preparation of 2-Substituted 1H-Perimidines
摘要:
2-substituted H-1-perimidines are readily prepared, in high yields, by refluxing a mixture of sodium pyrosulfite, an aldehyde, and 1,8-diaminonaphthalene in aqueous ethanol or N,N-dimethylformamide. The method is of wide applicability except from araldehydes bearing a strong electron-withdrawing group (-CN, -NO2).
A Cobalt Catalyst Permits the Direct Hydrogenative Synthesis of 1
<i>H</i>
‐Perimidines from a Dinitroarene and an Aldehyde
作者:Tobias Schwob、Mirco Ade、Rhett Kempe
DOI:10.1002/cssc.201900498
日期:2019.7.5
A new sustainable catalytic reaction, the synthesis of 1H‐ perimidines from a dinitroarene and an aldehyde in the presence of H2, was achieved. An earth‐abundant metal catalyst was developed to permit the efficient, highly chemoselective, and consecutive hydrogenation of dinitroarenes. The catalyst was reusable and easy to handle. The use of a specific Co complex and its pyrolysis at a certain temperature
Arylidene Meldrum's acid is employed as a source of the arylgroup and oxidant for the synthesis of 2-aryl-1H–benzimidazoles by a condensation reaction with 1,2-phenylenediamine in refluxing ethanol with good to high yields. Arylidene Meldrum's acids were also used as a source of the arylgroup and oxidant for the synthesis of 2-aryl-1H-perimidines by a condensation reaction with 1,8-diaminonaphthalene
Rational design of an efficient one-pot synthesis of 6H-pyrrolo[2,3,4-gh]perimidines in polyphosphoric acid
作者:Alexander V. Aksenov、Nicolai A. Aksenov、Dmitrii S. Ovcharov、Dmitrii A. Aksenov、Georgii Griaznov、Leonid G. Voskressensky、Michael Rubin
DOI:10.1039/c6ra17269e
日期:——
Several highly efficient one-pot synthetic protocols were developed, enabling polyphosphoric acid-activated nitroalkanes to act as electrophiles in reactions with aminonapthalenes. The featured methods allow for the single step assembly of...
Pyrimidines as Surrogates for 1,3-Dicarbonyl Compounds in<i>peri</i>Annulation of Perimidines en Route to 1,3-Diazapyrenes
作者:Alexander V. Aksenov、Stanisvlav V. Shcherbakov、Irina V. Lobach、Inna V. Aksenova、Michael Rubin
DOI:10.1002/ejoc.201601589
日期:2017.3.27
A highly efficient protocol for acid-mediated peri-annulation of perimidines with pyrimidines was developed. Pyrimidines, used as surrogates for 1,3-dicarbonylcompounds allow for furnishing benzo[gh]perimidines, including hardly available analogs, non-substituted, or mono-substituted at C-6, C-8. Limitations of reactions employing 5-bromopyrimidines are investigated.
Application of Bertagnini's Salts in a Mechanochemical Approach Toward Aza‐Heterocycles and Reductive Aminations via Imine Formation
作者:Sourav Behera、Shyamal Kanti Bera、Francesco Basoccu、Federico Cuccu、Pietro Caboni、Lidia De Luca、Andrea Porcheddu
DOI:10.1002/adsc.202301407
日期:——
with solid reagents. We have showcased the practicality of Bertagnini's salts, also called aldehyde-bisulfite adducts, which are crystalline, simplifying preparation and storage. These salts are stable substitutes for liquid aldehydes and ketones that have been effectively employed in reductive amination, synthesizing aza-heterocycles and hydrazones within mechanochemistry. The technique's effectiveness