Synthesis and structure of novel (S)-1,6-dialkylpiperazine-2,5-diones and (3S,6S)-1,3,6-trialkylpiperazine-2,5-diones
作者:Črt Malavašič、Uroš Grošelj、Amalija Golobič、Jure Bezenšek、Branko Stanovnik、Katarina Stare、Jernej Wagger、Jurij Svete
DOI:10.1016/j.tetasy.2011.03.014
日期:2011.3
N-alkylation, N-acylation and cyclisation. The synthesis of (S)-1,6-dialkylpiperazine-2,5-diones has a broad scope allowing preparation of diketopiperazines with primary and secondary alkyl groups at N(1), while the synthesis of (3S,6S)-1,3,6-trialkylpiperazine-2,5-diones is limited to compounds with primary alkyl groups at N(1). Reductive alkylation of amino acid ester hydrochlorides by catalytic
从相应的(S)分三步制备11个(S)-1,6-二烷基哌嗪-2,5-二酮和五个(3 S,6 S)-1,3,6-三烷基哌嗪-2,5-二酮-α-氨基酸酯,包括还原性N-烷基化,N-酰化和环化。(S)-1,6-二烷基哌嗪-2,5-二酮的合成具有广阔的范围,可以制备在N(1)上具有伯烷基和仲烷基的二酮哌嗪,而合成(3 S,6 S)-1,3,6-三烷基哌嗪-2,5-二酮仅限于在N(1)具有伯烷基的化合物。在羰基化合物的存在下,通过催化氢化对氨基酸酯盐酸盐进行还原性烷基化被证明是制备稳定的(可储存的)α-烷基氨基酸酯盐酸盐的一种简单,有效和通用的方法。通过NMR和X射线衍射确定新化合物的结构。