Homochiral (R)- and (S)-3,4-methylenedioxymethamphetamine (MDMA) were prepared in six steps (each) from the chiral pool precursors d- and l-alanine, respectively. The key step, copper-catalysed regioselective ring-opening of an N-tosylaziridine with an aryl Grignard reagent, proceeded in high yield with complete regioselectivity. Elaboration was achieved with preservation of configurational integrity, affording R- and S-MDMA hydrochlorides with enantiopurities of >99.5%, as determined by enantioselective HPLC with fluorescence detection. Attempts to apply the synthetic methodology to the synthesis of the homochiral enantiomers of the α-phenyl analogue of MDMA (UWA-001) were thwarted by a switch in regioselectivity in the key step.
通过六个步骤(每个步骤)分别从手性池前体 d- 丙
氨酸和 l- 丙
氨酸制备了同手性 (R)- 和 (S)-3,4- 亚甲二氧基甲基苯
丙胺(M
DMA)。关键步骤是
铜催化 N-对
甲苯磺酰基
氮丙啶与芳基
格氏试剂的区域选择性开环反应,该反应具有高产率和完全区域选择性。通过对映体选择性高效
液相色谱法(HPLC)和荧光检测法测定,在保留构型完整性的情况下,得到了对映体杂质为 99.5%的 R- 和 S-M
DMA 盐酸盐。在尝试将该合成方法应用于合成 M
DMA 的 α-苯基类似物(UWA-001)的同手性对映体时,由于关键步骤中的区域选择性转换而受挫。