LY-341495
(2S)-2-氨基-2-[(1S,2S)-2-羧基环丙-1-基]-3-(吨-9-基)丙酸Chemical Name: 2(S)-Amino-2-[2(S)-carboxy-1(S)-cyclopropyl]-3-(9H-xanthen-9-yl)propionic acid
CAS No. 201943-63-7
项目整合开发状态: Preclinical
项目研究机构: Lilly (Originator)
合成路线:Partial hydrolysis of chiral cyclopropanedicarboxylate (I) with 1 equivalent of NaOH in aqueous isopropanol provided monoester (II),which was converted to acid chloride (III) by treatment with SOCl2.Palladium-mediated coupling of (III) with the organozincate from 9-xanthenylmethyl iodide (IV) and Zn-Cu couple afforded (S,S)-ketone (V).Basic hydrolysis of (V) then provided ketoacid (VI),which was transformed into a mixture of diastereomeric hydantoins (VII) under Bucherer-Berg conditions using an excess of KCN and (NH4)2CO3 in water at 55 C.Subsequent reaction of (VII) with 4-methoxybenzyl bromide (VIII) and KHCO3 in DMF produced both N- and O-alkylation to provide a diastereomeric mixture,which was separated by column chromatography.Hydrolysis of isomer (IX) with aqueous Ba(OH)2 in a pressure reactor at 200 C gave the target (S,S,S)-amino acid,which was purified by cation-exchange chromatography.
合成路线:Partial hydrolysis of dimenthyl (R,R)-cyclopropane-1,2-dicarboxylate (I),followed by treatment of the resultant mono-carboxylic acid with SOCl2,afforded acid chloride (II).The coupling of the organozincate reagent prepared from (9-xanthyl)methyl iodide (III) and Zn-Cu with acid chloride (II) in the presence of palladium catalyst gave rise to ketone (IV).Basic hydrolysis of the remaining menthyl ester function of (IV) afforded keto acid (V).Reaction of (V) with potassium cyanide and ammonium carbonate produced hydantoin (VI) as a diastereomeric mixture.Chromatographic separation of the diastereoisomers was achieved after hydantoin N-alkylation and simultaneous esterification of (VI) with p-methoxybenzyl chloride (VII) and KHCO3 in hot DMF.Hydantoin hydrolysis from the desired (S,R,R)-isomer (VIII) upon heating with aqueous Ba(OH)2 at 200 C in a pressure vessel furnished the title amino acid compound.
📌 参考资料/链接：
参考文献标题:2-Substituted (2SR)-2-amino-2-(1SR,2SR)-2-carboxycycloprop-1-yl)glycines as potent and selective antagonists of group II metabotropic glutamate receptors.2.Effects of aromatic substitution,pharmacological characterization,and bioavailability
文献作者:Ornstein,P.L.; Bleisch,T.J.; Brian Arnold,M.; Kennedy,J.H.; Wright,R.A.; Johnson,B.G.; Tizzano,J.P.; Helton,D.R.; Kallman,M.J.; Schoepp,D.D.; Herin,M.
参考来源:J Med Chem 1998,41(3),358
📄 详细内容
合成路线:Partial hydrolysis of chiral cyclopropanedicarboxylate (I) with 1 equivalent of NaOH in aqueous isopropanol provided monoester (II),which was converted to acid chloride (III) by treatment with SOCl2.Palladium-mediated coupling of (III) with the organozincate from 9-xanthenylmethyl iodide (IV) and Zn-Cu couple afforded (S,S)-ketone (V).Basic hydrolysis of (V) then provided ketoacid (VI),which was transformed into a mixture of diastereomeric hydantoins (VII) under Bucherer-Berg conditions using an excess of KCN and (NH4)2CO3 in water at 55 C.Subsequent reaction with 4-methoxybenzyl bromide (VIII) and KHCO3 in DMF produced both N- and O-alkylation to provide a diastereomeric mixture,which was separated by column chromatography.Hydrolysis of isomer (IX) with aqueous Ba(OH)2 in a pressure reactor at 200 C gave the target (S,S,S)-amino acid,which was purified by cation-exchange chromatography.
参考文献标题:[3H]LY341495,a highly potent,selective and novel radioligand for labeling group II metabotropic glutamate receptors
文献作者:Ornstein,P.L.; Arnold,M.B.; Bleisch,T.J.; Wright,R.A.; Wheeler,W.J.; Schoepp,D.D.
参考来源:Bioorg Med Chem Lett 1998,8(14),1919
产品链接: CAS No. 201943-63-7››