Selectively protected chiral 1,2,4-triaminobutanes and chiral vicinal 1,2-diamines
作者:Janina Altman、Dov Ben-Ishai、Wolfgang Beck
DOI:10.1016/s0957-4166(00)86240-0
日期:1994.5
Stepwise t-butoxycarbonylation of (S)-5-aminomethyl-2-pyrrolidone to mono-, di- and triacylated compounds has been elaborated. Ring opening of (S)-5-(Boc-aminomethyl)-N-1-Boc-2-pyrrolidone with LiOH afforded the Boc-protected 4,5-diaminovaleric acid, whereas with NaBH4 the Boc-protected (S)4,5-diamino-pentanol was obtained The acid underwent Curtius rearrangement to the corresponding isocyanate which was transformed to (S)-N-1,N-2-di-Boc-1,2,4-triaminobutane and to N-1,N-2-di-Boc-N-4-Z-triaminobutane. Curtius rearrangement of (S)-N-4,N-5-di-Z-valeric acid and pTSA catalyzed addition of t-BuOH to the isocyanate, yielded N-1,N-2-di-Z-N-4-Boc-1,2,4-triaminobutane.