Synthesis, anti-GABA activity and preferred conformation of bicuculline and norbicuculline enantiomers
作者:J Kardos、T Blandl、ND Luyen、G Dörnyei、E Gács-Baitz、M Simonyi、DJ Cash、G Blaskó、Cs Szántay
DOI:10.1016/0223-5234(96)83969-9
日期:1996.1
Synthesis of erythro-(+/-)-[1SR,9RS]-norbicuculline and threo-(+/-)-[1SR,9SR]-noradlumidine from piperonal was performed using Bischler-Napieralski cyclization as a key step. Resolution gave rise to (+)-[1S,9R]-norbicuculline ([1S,9R] norBIC) and (-)-[1R,9S]-norbicuculline ([1R,9S] norBIC) in >99.5% enantiomeric purity. Bicuculline enantiomers were readily obtained by methylation of the latter products
使用Bischler-Napieralski环化作为关键步骤,从胡椒醛中合成了赤型-(+/-)-[1SR,9RS]-核苷和苏型-(+/-)-[1SR,9SR]-去甲rad啶。拆分产生对映体纯度> 99.5%的(+)-[1S,9R]-冰核碱([1S,9R] norBIC)和(-)-[1R,9S]-冰核碱([1R,9S] norBIC)。通过将后面的产物甲基化,可以容易地获得双瓜氨酸对映异构体。作为抑制GABA(A)受体结合的抑制剂,[1S,9R] BIC的效力比[1R,9S] BIC的效力高约70倍,在pH 7.1和5.0时,[1S,9R] BIC的效力比[1S,9R] norBIC约高100到900倍分别。同样,[1S,9R] norBIC作为[1S,9R] BIC作为GABA特异性(36)Cl(-)离子通量的抑制剂的效力要低得多。观察到[1S中,由N2-CH(3)取代引起的体外生物活性增加了大约两个数量级,