135099-82-0

Upstream product

• 2743-38-6 O,O'-dibenzoyl-L-tartaric acid 
• 50-00-0 formaldehyd 

Downstream Products

• 300661-83-0 diethyl 15aS-ethyl-2,3,6,11,15,15a-hexahydro-1H,5H-indolo[2,3-a]pyrano[3,2-i]quinolizine-14,14-(13H)-dicarboxylate 
• 135266-72-7 (1S,12bS)-1-(2,2'-diethoxycarbonylethyl)-1-ethyl-1,2,3,4,6,7,12,12b-octahydroindolo[2,3-a]quinolizine 

Relevant academic research and scientific papers

Preparation methods for chiral impurities of vincamine

The invention relates to preparation methods for chiral impurities of vincamine. Through oriented synthesis method and the later column chromatography separation, high purity product of seven chiral impurities can be obtained, and the preparation methods can be used for the qualitative and quantitative analysis of impurities in the production of vincamine, so that the separation and confirmation of the seven chiral impurities in vincamine drugs can be realized, and the drug standard of the vincamine can be enhanced, and therefore, the vincamine with high purity can be obtained. Compared with existing preparation methods for the vincamine, the preparation methods relate to the preparation of seven chiral isomers, and are more complete and simpler in operation.

Synthesis of pentacyclic ring systems, indolo[2,3-a][1,2]-oxazino[5,6-i]quinolizine and indolo[2,3-a]pyrano[3,2-i]-quinolizine, and their application for the synthesis of eburnamine-vincamine alkaloids

15a-Ethyl-14-carboxylic esters of the title pentacycles (6) and (8) were prepared via Wenkert's enamine (4). Both compounds can be readily transformed into indoloquinolizinylpyruvate oxime esters (5), key intermediates for the synthesis of vincamine alkal