The reduction of 3,8-diacetyl porphyrin I with borane-methyl sulfide complex, BMS, as stoichiometric reductant and rnethyloxazaborolidine 2 and ent-2 as catalysts allows the enantioselective preparation of hematoporphyrin IX dimethyl ester stereoisomers. Hematoporphyrin was first obtained by THUDIC
Synthesis of stereoisomers of antithrombotic nipecotamides
โ Scribed by Xiaozhang Zheng; Cynthia Day; Ram Gollamudi
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 603 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0899-0042
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
A stereoisomer of ptychanolide 1 was synthesized by a method which includes an a-alkynone cyclization. Ptychanolide, a sesquiterpenoid constituent of the Liverwort Ptychanthus striatus (Lehm. et Lindenb.) Nees isolated by Takeda et al.,' was shown by degradation to have structure 1, which contains
## Abstract **Die Synthese von Stereoisomeren des Arteannuins B** Wir beschreiben die Synthese von drei racโDiastereomeren **7Aโ7C** des Sesquiterpenlaktons Arteannuin B **(I)** auf dem in den __Schemata 2__ und __3__ zusammengefassten Weg. Als Schlรผsselstufe fรผr den Aufbau des Ringsystems **6** w
The three possible isomers of poLygodiaZ, epimers at C-9, cis and trans fused, are described. Controlled kinetic and thermodynamic epimerizations allow preparation of all stereoisomers from the same key intermediate.