Tetrahydro-4(1<i>H</i>)-pyrimidinone Ring Formation of Bellenamine, a Biogenic Amine, with Carbonyl Compounds
作者:Yoko Ikeda、Shuichi Gomi、Hiroshi Naganawa、Daishiro Ikeda、Shinichi Kondo
DOI:10.1246/bcsj.67.1904
日期:1994.7
Bellenamine, (R)-3,6-diamino-N-(aminomethyl)hexanamide in a neutral aqueous solution at 37 °C formed a new tetrahydro-4(1H)-pyrimidinone compound, N1,N3-methylenebellenamine by the reaction with self-generated formaldehyde. The structure was elucidated by NMR spectral analyses. Two tetrahydro-4(1H)-pyrimidinone compounds, N1,N3-methylenebellenamine and (R)-6-(3-aminopropyl)tetrahydro-4(1H)-pyrimidinone (tentatively named cyclized bellenamine) were synthesized from bellenamine and d-β-lysinamide, respectively, with an equimolar amount of formalin in good yields. However, formation of a 5-membered ring 4-imidazolidinone compound by the reaction of l-lysinamide with formalin was a very low yield. Reaction of bellenamine with acetaldehyde gave a mixture of four diastereomeric aldol adducts. By the reaction with acetone or diacetone alcohol, two stereoisomeric diacetone adducts, (2R,9aS)- and (2R,9aR)-2-(3-aminopropyl)-8,8,9a-trimethyloctahydro-4H-pyrimido[1,6-a]pyrimidin-4-one, were obtained. Although these adducts were difficult to separate, the (2R,9aR) diastereomer was more stable than the other in acidic aqueous solution.
贝拉那明、(R)-3,6-二氨基-N-(氨基甲基)己酰胺在 37 °C 的中性水溶液中与自身生成的甲醛反应生成了一种新的四氢-4(1H)-嘧啶酮化合物 N1,N3-亚甲基贝拉那明。核磁共振光谱分析阐明了其结构。用等摩尔量的福尔马林分别从贝烯胺和 d-β-lysinamide 合成了两种四氢-4(1H)-嘧啶酮化合物,即 N1,N3-亚甲基贝烯胺和 (R)-6-(3- 氨基丙基)四氢-4(1H)-嘧啶酮(暂命名为环化贝烯胺),产量良好。然而,l-赖氨酰胺与福尔马林反应生成 5 元环 4-咪唑烷酮化合物的收率非常低。贝拉那胺与乙醛反应生成了四种非对映醛醇加合物的混合物。通过与丙酮或二丙酮醇反应,得到了两种立体异构体二丙酮加合物,即 (2R,9aS)- 和 (2R,9aR)-2-(3-氨基丙基)-8,8,9a-三甲基八氢-4H-嘧啶并[1,6-a]嘧啶-4-酮。虽然这些加合物很难分离,但(2R,9aR)非对映异构体在酸性水溶液中比另一种更稳定。