393563-08-1

Upstream product

• 96930-18-6 (4R,5S)-4-methyl-3-pent-4-enoyl-5-phenyloxazolidin-2-one 
• 75-07-0 acetaldehyde 

Downstream Products

• 393563-22-9 (1S,12bR)-1-ethyl-1-(2-tert-butyldiphenylsilyloxyethyl)-4-oxo-2,3,6,7,12,12b-hexahydro-1H-indolo[2,3-a]quinolizine 
• 393563-18-3 (1S,12bS)-1-ethyl-1-(2-tert-butyldiphenylsilyloxyethyl)-4-oxo-2,3,6,7,12,12b-hexahydro-1H-indolo[2,3-a]quinolizine 
• 262847-04-1 (5S)-N-[2-(3-indolyl)ethyl]-5-ethyl-5-(2-tert-butyldiphenylsiloxyethyl)-6-hydroxy-δ-lactam 
• 262847-03-0 (4S)-N-[2-(3-indolyl)-ethyl]-4-ethyl-4-hydroxymethyl-6-tert-butyldiphenylsiloxyhexamide 
• 393563-17-2 (4S)-N-[2-(3-indolyl)ethyl]-4-ethyl-4-(2-tert-butyldiphenylsiloxyethyl)-5-oxopentamide 
• 262846-97-9 (2S)-[5-(tert-butyldiphenylsilyloxy)-2-ethylpentyl]-α-diazo-α-(methoxycarbonyl)acetate 
• 262847-01-8 (4S)-4-[3-(tert-butyldiphenylsilyloxypropyl)]-4-ethyl-3-(methoxycarbonyl)dihydro-2(3H)-furanone 
• 262847-00-7 (2S)-[5-(t-butyldiphenylsilyloxy)-2-ethylpentyl]-α-(methoxycarbonyl)acetate 
• 262847-09-6 (4S)-4-[3-(tert-butyldiphenylsilyloxypropyl)]-4-ethyldihydro-2(3H)-furanone 
• 4880-88-0 vinburnine 
• 121074-25-7 (4R,5S)-3-[(2S)-1-oxo-2-ethyl-4-pentenyl]-4-methyl-5-phenyl-2-oxazolidinone 
• 393563-09-2 (4R,5S)-3-[(2R)-2((1R*)-1-(phenoxythiocarbonyloxy)ethyl)-1-oxo-4-pentenyl]-4-methyl-5-phenyl-2-oxazolidinone 

Relevant academic research and scientific papers

Asymmetric synthesis of (-)-eburnamonine and (+)-epi-eburnamonine from (4s)-4-ethyl-4-[2-(hydroxycarbonyl)ethyl]-2-butyrolactone

The key chiral nonracemic 4,4-disubstituted 2-butyrolactone carboxylic acid, (S)-4, is readily accessible via an efficient and stereospecific dirhodium(II) tetraacetate catalyzed tertiary C-H insertion reaction of the diazomalonate (S)-5. The coupling of the acid (S)-4 with tryptamine produces the amide (S)-3, which is then transformed into the aldehyde 23 and hydroxy-lactam 24. Acid-mediated Pictet-Spengler cyclization of 23 and 24 produces the tetracyclic indole lactams (1S,-12bS)-25a and (1S,12bR)-25b. Compounds 25a and 25b are converted, via the lactam alcohols 30a and 30b, to (-)-eburnamonine (1a) and (+)-epi-eburnamonine (1b).