Enantiospecific synthesis of the sugar amino acid (2S,5S)-5-(aminomethyl)-tetrahydrofuran-2-carboxylic acid
作者:María Laura Uhrig、Mario J. Simirgiotis、Oscar Varela
DOI:10.1016/j.tetasy.2010.08.013
日期:2010.10
An enantiospecific synthesis of the tetrahydrofuran amino acid (2S,5S)-5-(aminomethyl)-tetrahydrofuran-2-carboxylic acid 1 is reported. The sugar enone 2-(S)-octyl 6-O-acetyl-3,4-dideoxy-α-d-glycero-hex-3-enopyranosid-2-ulose 2a, derived from galactose, was employed as a chiral precursor. The enone 2a was converted by chemical manipulation of the functional groups into the 6-azido-2-O-tosyl-3,4,6-
据报道,对映体合成了四氢呋喃氨基酸(2 S,5 S)-5-(氨基甲基)-四氢呋喃-2-羧酸1。衍生自半乳糖的糖烯酮2-(S)-辛基6 - O-乙酰基-3,4-二脱氧-α-d-甘油-己基-3-烯吡喃糖苷-2-ulose 2a被用作手性前体。通过官能团的化学操作将烯酮2a转化成6-叠氮基-2- O-甲苯磺酰基-3,4,6-三苯氧基-双-赤型-己基-1,5-内酯9作为关键中间体。甲醇分解9甲苯磺酸酯的取代引起内酯的开放和C-5处羟基对C-2的攻击。该反应导致形成(2S,5S)-5-(叠氮甲基)-四氢呋喃-2-羧酸甲酯10的四氢呋喃环,该环很容易转化为1。该序列的总产率为35%,并且所有中间体和最终产物均已被充分表征。另外,已经确定了内酯9和靶分子1在溶液中的优先构象。