(R)-1-苄基-3-甲基哌嗪置于palladium Dihydroxide 氢气体系中,用 乙醇,二氯甲烷 用作溶剂,25.0 °C,241.32 Kpa 条件下,反应 32.0H,反应生成(R)-1-N-Boc-2-甲基哌嗪
参考文献:Asymmetric Synthesis Of 2,6-Methylated Piperazines
标题:Asymmetric Synthesis Of 2,6-Methylated Piperazines
摘要:The Complete Series Of Enantiopure 2,6-Methylated Piperazines Was Synthesized Utilizing Two Alternative Reactions In The Key Bond-Forming Step. The Dimethyl Enantiomers,(2R,6R)-And (2S,6S)-2,6-Dimethylpiperazine (1,2),Were Prepared Using Either A Diastereoselective Triflate Alkylation Or A Novel Intramolecular Mitsunobu Reaction To Set The Required Stereochemistry. The Monomethyl Derivatives,(R)-And (S)-Tert-Butyl 2-Methyl-1-Piperazinecarboxylate (3,4) Were Also Synthesized Employing The Mitsunobu Cyclization Strategy While The Trimethyl Compounds,(R)-And (S)-2,2,6-Trimethylpiperazine (5,6) Were Prepared Using An Enantiospecific Triflate Alkylation As The Principal Reaction. These Methods Represent Efficient,General Strategies For Preparing A Variety Of 2,6-Methylated Piperazines For Which The Absolute Stereochemistry Can Be Readily Controlled.
Doi:10.1021/jo00118A039