Enantioselective deprotonation of the 8-oxabicyclo[3.2.1]octan-3-one: Synthesis of 8-oxa-norcocaines and 8-oxa-pseudonorcocaines
作者:Daniele Simoni、Marinella Roberti、Riccardo Rondanin、Alan P. Kozikowski
DOI:10.1016/s0040-4039(99)00763-7
日期:1999.6
deprotonation of the 8-oxabicyclo[3.2.1]octan-3-one with chiral lithium amides 5 and 6, in the presence of LiCl, gave the chiral lithium enolates which were in turn reacted with methyl cyanoformate. The resulting chiral β-keto esters were reduced with sodium amalgam to afford the 8-oxa-ecgonine- and 8-oxa-pseudoecgonine-like derivatives which allowed facile preparation of the (+)- and (−)-8-oxa-norcocaines
2-Carbomethoxy-3-aryl-8-oxabicyclo[3.2.1]octanes: Potent Non-Nitrogen Inhibitors of Monoamine Transporters
作者:Peter C. Meltzer、Anna Y. Liang、Paul Blundell、Mario D. Gonzalez、Zhengming Chen、Clifford George、Bertha K. Madras
DOI:10.1021/jm9703045
日期:1997.8.1
Cocaine is a potent stimulant of the mammalian central nervous system. Its reinforcing and stimulant properties have been associated with its propensity to bind to monoamine transporter systems. It has generally been assumed t;hat the amino function on monoamines is a requirement for binding to monoamine transporters. In particular, the 8-amino function on the tropane skeleton of cocaine and cocaine analogs has been assumed to provide an ionic bond to the aspartic acid residue on the dopamine transporter(DAT). We have prepared the first 8-oxa analogs of the 3-aryltropanes (WIN compounds) and have found that the 3 beta-(3,4-dichlorophenyl) (6g) and 3 alpha-(3,4-dichlorophenyl) (7g) analogs are particularly potent (IC50 = 3.27 and 2.34 nM, respectively) inhibitors of the dopamine transporter. We now describe the synthesis and biology of the family of 2-carbomethoxy-3-aryl-8-oxabicyclo[3.2.1]octanes and demonstrate that an amino nitrogen is not required for binding to the DAT.