Synthesis of methoxy and hydroxy analogs of 1,2,3,4,4a,9a-hexahydro-4a-fluorenamine: rigid phencyclidine analogs as probes of phencyclidine binding site topography
作者:Yuan Ping Pang、Alan P. Kozikowski
DOI:10.1021/jo00014a033
日期:1991.7
(+)-1,2,3,4,4a,9a-Hexahydro-4a-fluorenamine (HFA) was found to be a potent and selective ligand for the phencyclidine (PCP) binding site of the N-methyl-D-aspartate (NMDA) receptor. This conformationally rigid PCP analogue has provided information about the binding conformation of PCP and the topography of its binding site. To further probe the topography of the PCP binding site, methods were developed for the synthesis of six oxygenated analogues of HFA that serve as probes of the putative hydrogen bonding interaction between the ligands and this binding site. This chemistry involves the Diels-Alder reaction of an appropriately substituted methyl indene-3-carboxylate with butadiene. Synthetic routes to all possible monomethoxylated derivatives of indene-3-carboxylate were thus devised and are detailed herein. An alternative method was developed to generate the homoenolate equivalent of 1-indanone, and a tert-butyl ester was demonstrated to act as a masked acid equivalent in the Friedel-Crafts acylation reaction.
(+)-1,2,3,4,4a,9a-六氢-4a-荧蒽胺(HFA)发现是对N-甲基-D-天冬氨酸(NMDA)受体的苯环己哌啶(PCP)结合位点具有强大且选择性的配体。这一构象刚性的PCP类似物提供了关于PCP结合构象及其结合位点地形的信息。为了进一步探索PCP结合位点的地形,开发了合成六种氧代HFA类似物的方法,这些类似物作为推测的配体与该结合位点之间氢键相互作用的探针。这一部分化学涉及了适当取代的甲基茚-3-羧酸酯与丁二烯的Diels-Alder反应。因此,设计了所有可能的单甲氧基化茚-3-羧酸酯的合成路线,并在本文中详细说明。还开发了一种替代方法来生成1-茚酮的同烯醇盐等价物,并证明叔丁基酯在Friedel-Crafts酰化反应中可作为阻胺酸等价物。