Alkylative Ring Opening of<i>N</i>-Methylaziridinium Ions and a Formal Synthesis of Tyroscherin
作者:Doo-Ha Yoon、Philjun Kang、Won Koo Lee、Yongeun Kim、Hyun-Joon Ha
DOI:10.1021/ol202683k
日期:2012.1.20
Alkylative ring-opening reactions of stable 2-substituted N-methylaziridinium ions proceeded with various alkyl- or arylmagnesium bromides in the presence of CuI to yield synthetically valuable and optically pure alkylated acyclic amines in a completely regio- and stereoselective manner. This was applied to a formal synthesis of the cytotoxic natural product tyroscherin.
A convenient synthesis of α-(aziridin-2-yl)-α-(trifluoromethyl) alcohols starting with ethyl aziridine-2-carboxylates is reported. Grignard reaction with the corresponding Weinreb amides led to aziridin-2-yl ketones, and subsequent treatment with Ruppert-Prakash reagent gave the trimethylsilylated target compounds as mixtures of diastereoisomers, which were desilylated with TBAF. In the case of ethyl