Hetero-Diels–Alder reactions of β-imino-meso-tetraphenylporphyrin derivatives: a new approach to pyrido[2,3-b]porphyrins
✍ Scribed by Cristina M.A Alonso; Maria G.P.M.S Neves; Augusto C Tomé; Artur M.S Silva; José A.S Cavaleiro
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- French
- Weight
- 65 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract The [4 + 2] cycloadditions of 2‐oxobut‐3‐enenitrile (1a), 2‐oxopent‐3‐enenitrile (1b), and ethyl 4‐cyano‐4‐oxobut‐2‐enoate (1c) with 1,3‐dimethyluracil (2), 1,3, 6‐trimethyluracil (9), or 1,3,5‐trimethyluracil (16) were investigated. The reactions of 1a with 2 or with 9 lead to bicyclic
TheN-Benzylirninederivedfrom2,3-di-O-benzyl-D-glyceraidehyde reactswithDanishefsky's diene to afford the correspondinghetero Diels-Alder adductwith a high diaatereoaelectivity. This compoundcanbe.transformed to enantiomerically pure(2R)40xopipecolicacid 01997 EIsevierScienceLtd. The piperidine ring
Asymmetric Hetero Diels-Alder Reaction of N-Benzylimines Derived from ( R)-Glyceraldehyde: A New Approach to Homochiral Piperidine Building Blocks and Its Application to the Synthesis of (2R)-4-Oxopipecolic Acid. -The D-glyceraldehyde derived N-benzyl imine (I) undergoes a highly diastereoselective