## Abstract Stereoselektive Synthesen der __Cinchona__ Alkaloide Chinin (**6**) und seiner natürlich vorkommenden Diastereomeren **7, 8** und **9**, ausgehend von Chinotoxin (**2**), werden beschrieben. Reduktion der Ketone **4** und **5** mit DIBAL ergibt ausschliesslich die C(8)–C(9) __erythro__‐
✦ LIBER ✦
Synthesis of ent-19-nortestosterone from its naturally occurring antipode
✍ Scribed by N.Miranda Teerhuis; Inès A.M Huisman; Marinus B Groen
- Book ID
- 104230368
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- French
- Weight
- 91 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
The synthesis of ent-19-nortestosterone from natural 19-nortestosterone is described. The synthetic sequence takes advantage of the 'near symmetry' properties of the steroid; removal/introduction of a methyl group and conversion of the A-into the D-ring and vice versa eventually results in overall inversion of the stereochemistry.
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