Aufbau der Ligandsysteme des C, D-Tetradehydrocorrins und Isobakteriochlorins durch Sulfidkontraktion. Kurzmitteilung
✍ Scribed by Silvio Ofner; Vittorio Rasetti; Beat Zehnder; Albert Eschenmoser
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- German
- Weight
- 792 KB
- Volume
- 64
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Synthesis of C, D‐Tetradehydrocorrins and Isobacteriochlorins via Sulfide Contraction
The reaction sequences shown in Schemes 4 and 5 illustrate the use of the sulfide contraction method for the synthesis of isobacteriochlorins and (metal free) C, D‐tetradehydrocorrins. The tetradehydrocorrin synthesis fills a gap in a spectrum of corrinoid (A → D) ring closures that ranges from A.W. Johnson's oxidative (A → D)‐cyclizations to octadehydrocorrinoids on the one side to the photochemical 1, 19‐secocorrin → corrincycloisomerization on the other (Scheme 7). Such a multiplicity of reaction paths towards corrinoids is of interest in connection with the problem of the origin of the corrin structure.