(3S,4Rs,5Rs)-3-Ethyl-4-(Hydroxymethyl)-5-(1-Methyl-1H-Imidazol-5-yl)Dihydro-2(3H)-Furanone置于palladium On Activated Charcoal 盐酸,Ammonium Formate体系中,用 甲醇 作为反应溶剂,化学反应 21.17H,反应生成 毛果芸香碱
参考文献:An Effective Chirospecific Synthesis Of (+)-Pilocarpine From L-Aspartic Acid
标题:An Effective Chirospecific Synthesis Of (+)-Pilocarpine From L-Aspartic Acid
摘要:A Short And Efficient Synthesis Of (+)-Pilocarpine (1) Has Been Accomplished In 10 Steps And 51 % Overall Yield From L-Aspartic Acid. The Synthesis Features A Diastereoselective Alkylation Of A Protected Aspartic Acid Diester Derivative And A Selective Hydrolysis Of The Alpha-Methyl Ester To Give The Corresponding Amino Acid. Subsequent Replacement Of The Amino Group With Bromo,Esterification,And A Modified Reformatsky Reaction With 1-Methylimidazole-5-Carboxaldehyde (8) Afforded Imidazole-Substituted Lactone 28. Details Concerning This Novel Lactone Synthesis Are Also Described. Finally,Hydrogenolysis Of The Lactone Carbon-Oxygen Bond And Selective Reduction Of The Resulting Monoester Afforded Pure (+)-Pilocarpine (1).
DOI:10.1021/jo00057A031