Two step, one-pot sequential synthesis of functionalized hybrid polyheterocyclic scaffolds <i>via</i> a solid state melt reaction (SSMR)
作者:Manickam Bakthadoss、Jayakumar Srinivasan、Mir Ashiq Hussain、Duddu S. Sharada
DOI:10.1039/c9ra02590a
日期:——
A new one pot assembly of highly functionalized benzo[a]phenazinone fused chromene/bicyclic scaffolds via a dominoKnoevenagel intramolecular hetero-Diels–Alder (IMHDA) strategy using a solid state melt reaction (SSMR) of 2-hydroxynaphthalene 1,4-dione, o-phenylenediamine, O-allyl salicylaldehyde/O-vinyl salicylaldehyde derivatives is reported. The formation of five new bonds (two C–C bonds and three
Cinchona alkaloid and di-tert-butyldicarbonate–DMAP promoted efficient synthesis of (E)-nitroolefins
作者:Nataraj Poomathi、Paramasivan T. Perumal
DOI:10.1039/c6ra06644e
日期:——
Synthesis of nitroolefins from aldehyde and olefin is generally limited by the formation of mixture of cis and trans compounds. Here we report an alternative, metal- free protocol for the...
Solid-State Melt Reaction for the Domino Process: Highly Efficient Synthesis of Fused Tetracyclic Chromenopyran Pyrimidinediones Using Baylis−Hillman Derivatives
A solid-state melt reaction (SSMR) has been demonstrated via a dominoprocess for the synthesis of tetracyclic chromenopyran pyrimidinedione frameworks using Baylis−Hillman derivatives through in situ formation of an olefin followed by an intramolecular [4 + 2] cycloaddition reaction sequence. The tetracyclic frameworks were obtained without using catalyst and solvent in a highly stereoselective and
One-Pot Synthesis of Benzothiazole-Tethered Chromanones/Coumarins via Claisen Rearrangement Using the Solid State Melt Reaction
作者:Manickam Bakthadoss、Raman Selvakumar
DOI:10.1021/acs.joc.5b02920
日期:2016.4.15
A novel protocol has been successfully established for the efficient synthesis of benzothiazole-tethered chromanone/coumarin scaffolds via Claisenrearrangement using a solid state melt reaction in a one-pot manner. Benzothiazole formation and Claisenrearrangement involve the cleavage of S–S and C–O bonds and formation of C–S, C═N, and C–C bonds in a single operation without using a catalyst or solvent
Rhodium-Catalyzed Diastereoselective [3 + 2] Cycloaddition of Carbonyl Ylide: An Access to the Core Ring System of Cordigol and Lophirone H
作者:Manickam Bakthadoss、Vishal Agarwal
DOI:10.1021/acs.joc.0c02073
日期:2020.12.4
synthetic strategy for the construction of tricyclic chromeno/quinolino furan frameworks via creation of two new rings and three contiguous stereogenic centers with high diastereoselectivity through a rhodium-catalyzed intramolecular carbonyl ylide cycloaddition reaction for the first time. This protocol allows the synthesis of the core ring system of natural products such as cordigol and lophirone H.