Acid-catalyzed aza-Diels–Alder versus 1,3-dipolar cycloadditions of methyl glyoxylate oxime with cyclopentadiene

On the scope of oxidation of tertiary amines: Meisenheimer rearrangements versus Cope elimination in 2-(cyanoethyl)-2-azanorbornanes

When oxidized, exo-2-(cyanoethyl)-2-azanorbornene is prone to [1,2]-Meisenheimer rearrangement, its endo isomer undergoes [2,3]-Meisenheimer and exo/endo-2-(cyanoethyl)-2-azanorbornanes afford N-hydroxylamines through Cope elimination.

2-Azanorbornane--a versatile chiral aza-Diels-Alder cycloadduct: preparation, applications in stereoselective synthesis and biological activity

The review presents the achievements in the field of preparation of chiral 2-azanorbornyl derivatives and their application in various stereoselective reactions as well as in biomimetic studies.

S. Cordeiro MN. Simple descriptors for assessing the outcome of aza-Diels–Alder reactions

Taft’s constants are important descriptors for predicting the outcome of aza-Diels–Alder reactions, correctly reproducing the results from DFT calculations.

New L-serine derivative ligands as cocatalysts for diels-alder reaction

New L-serine derivative ligands were prepared and tested as cocatalyst in the Diels-Alder reactions between cyclopentadiene (CPD) and methyl acrylate, in the presence of several Lewis acids. The catalytic potential of the in situ formed complexes was evaluated based on the reaction yield. Bidentate serine ligands showed good ability to coordinate medium strength Lewis acids, thus boosting their catalytic activity. The synthesis of the L-serine ligands proved to be highly efficient and straightforward.

(1RS,4RS,5RS)-Methyl 2-(3,5-dinitrobenzoyl)-2-oxa-3-azabicyclo[3.3.0]oct-7-ene-4-carboxylate

The title compound, C₁₅H₁₃N₃O₈, comprises two crystallographically independent mol­ecules in the asymmetric unit. In the crystal, intermolecular C—H⋯O hydrogen bonds link the molecules and short C=O⋯π contacts are seen.

Methyl 2-diphenyl-phosphor-yloxy-2-aza-bicyclo-[2.2.1]hept-5-ene-3-exo-carboxyl-ate

In the title compound, C₂₀H₂₀NO₄P, the dihedral angle between the phenyl rings is 68.52 (7)°. In the crystal structure, the mol­ecules are linked by a weak C—H⋯π(arene) inter­action along [010] involving the phenyl CH group and the phenyl rings. There are no further significant inter­molecular inter­actions.