An Improved Process for the Preparation of Trimethylhydrazine and Its Coupling with an Activated Acid Intermediate
作者:Silvina García-Rubio、Chandra D. Wilson、Deborah A. Renner、John O. Rosser、Debasis Patra、J. Gregory Reid、Seemon H. Pines
DOI:10.1021/op0342022
日期:2004.5.1
Trimethylhydrazine (TMH) was prepared in two steps from 1,1-dimethylhydrazine, using an easy to scale-up procedure that avoided difficult acid−base extractions. The procedure provided TMH as a solution in 1,4-dioxane, in a form that was easy and safe to handle in a coupling with an enantiomerically pure, sterically hindered, Boc-protected-amino acid, 1. This key coupling reaction in the preparation
三甲基肼 (TMH) 由 1,1-二甲基肼分两步制备,采用易于放大的程序,避免了困难的酸碱萃取。该程序提供了 TMH 作为 1,4-二恶烷溶液,其形式在与对映体纯、空间位阻、Boc 保护的氨基酸 1 偶联时易于操作且安全。 3的制备通过相应的酰氯完成,从而避免了使用昂贵的偶联剂。