Process Development of (1<i>S</i>,2<i>S</i>,5<i>R</i>,6<i>S</i>)- Spiro[bicyclo[3.1.0]hexane-2‘,5‘-dioxo-2,4‘-imidazolidine]-6-carboxylic Acid, (<i>R</i>)-α-Methylbenzenemethanamine Salt (LSN344309)
作者:Ossama M. Rasmy、Radhe K. Vaid、Michael J. Semo、Erik C. Chelius、Roger L. Robey、Charles A. Alt、Gary A. Rhodes、Jeffery T. Vicenzi
DOI:10.1021/op049829e
日期:2006.1.1
process for the synthesis of 4 and its resolution to obtain (1S,2S,5R,6S)-spiro[bicyclo[3.1.0]hexane-2‘,5‘-dioxo-2,4‘-imidazolidine]-6-carboxylic acid, (R)-α-methylbenzenemethanamine salt (5) are described. Starting from the inexpensive raw 2-cyclopenten-1-one and sulfur ylide 1 the racemic bicyclo keto ester 2 was synthesized. Reaction of 2 with potassium cyanide and ammonium carbonate under Bücherer−Berg's
合成4及其拆分制备(1 S,2 S,5 R,6 S)-螺[bicyclo [3.1.0]己烷-2',5'-dioxo-描述了2,4'-咪唑烷] -6-羧酸,(R)-α-甲基苯甲胺盐(5)。从廉价的原料2-环戊烯-1-酮和硫叶立德开始1外消旋双环酮酯2的合成。的反应2与下布赫尔-伯格的反应条件,得到外消旋的氰化钾和碳酸铵3以80%的产率。水解3然后用(R)-(+)-α-甲基苄胺进行拆分,在优化的条件下得到优异的收率和纯度4。还讨论了原始发现过程的改进,以适应安全和环境要求,以扩大制造工厂的规模。