122584-18-3Relevant academic research and scientific papers
Development of a pilot scale process for the anti-alzheimer drug (-)-galanthamine using large-scale phenolic oxidative coupling and crystallisation-induced chiral conversion
Kueenburg, Bernhard,Czollner, Laszlo,Frohlich, Johannes,Jordis, Ulrich
, p. 425 - 431 (1999)
(-)-Galanthamine has been synthesised using an efficient nine-step procedure, which in large scale affords 12.4 (6.7-19.1)% overall yield. The process improvements and optimization of each step are described. Notable steps include (i) an oxidative phenol coupling and (ii) crystallisation-induced chiral conversion of (±)-narwedine to (-)-narwedine. This is a practical and cost-effective synthesis of (-)-galanthamine which is amenable to pilot plant scale-up to afford sufficient material for use in clinical trials.
Biomimetic synthesis of galantamine: Via laccase/TEMPO mediated oxidative coupling
Baratto, Maria Camilla,Bizzarri, Bruno Mattia,Botta, Lorenzo,Pogni, Rebecca,Saladino, Raffaele,Zippilli, Claudio
, p. 10897 - 10903 (2020/03/27)
Laccase-mediated intramolecular oxidative radical coupling of N-formyl-2-bromo-O-methylnorbelladine afforded a novel and isolable spirocyclohexadienonic intermediate of galantamine. High yield and conversion of substrate were obtained in the presence of the redox mediator 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO). This laccase procedure, with an overall yield of 34%, represents a scalable and environmentally friendly alternative to previously reported syntheses of galantamine based on the use of potassium ferricyanide as an unspecific radical coupling reagent.
Processes for the preparation of derivatives of 4a, 5, 9, 10, 11, 12-hexahydro-6H-benzofuro-[3a, 3, 2-ef][2]benzazepine
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Example 9, (2008/06/13)
The invention relates to processes for the preparation of 4a,5,9,10,11,12-hexahydro-6H-benzofuro[3a,3,2-ef][2]benzazepine, or derivatives thereof. Furthermore, the invention also relates to the compounds formed during the preparation of 4a, 5,9,10,11,12-hexahydro-6H-benzofuro[3a,3,2-ef][2]benzazepine.
New kilogram-synthesis of the anti-Alzheimer drug (-)-galanthamine
Czollner, Laszlo,Frantsits, Werner,Kueenburg, Bernhard,Hedenig, Ursula,Froehlich, Johannes,Jordis, Ulrich
, p. 2087 - 2088 (2007/10/03)
A concise, scalable synthesis of (-)-galanthamine, a drug being used for the treatment of Alzheimer's disease, is described. The yield of the critical phenolic coupling step was optimized to 45-50%. For the reduction of the aryl bromide, air-activated LiAlH4 was used and racemic narwedine was converted to (-)-narwedine by a second order asymmetric transformation.
An improved synthesis of galanthamine
Szewczyk,Lewin,Carroll
, p. 1809 - 1811 (2007/10/02)
Modifications in the total synthesis of the Amarylidaceae alkaloid of galanthamine from commercially available isovanillin and tyramine have resulted in a shortened reaction sequence, which is amenable to upscaling and in improved product yield.
