Four isomers of terguride, a semisynthetic ergot alkaloid derivative, have been prepared by catalytic hydrogenation of (5R,8S)- and (5S,8S)-lisuride [1,1-diethyl-3-(6-methyl-8-ergolenyl)urea]. Relative stereochemistry of the isomers is based on NMR and CD spectra. Absolute configuration of all the series has been confirmed by the X-ray crystal structure determination of (5R,8S,10S)-terguride 2-bromobenzoate [1,1-diethyl-3-(6-methyl-8-isoergolenyl)urea, cis-dihydrolisuride].
四种特古利德同分异构体,是半合成麦角生物碱衍生物,通过(5R,8S)-和(5S,8S)-利舒瑞德[1,1-二乙基-3-(6-甲基-8-麦角酚基)脲]的催化氢化制备而成。同分异构体的相对立体化学基于核磁共振和圆二色谱。所有系列的绝对构型均通过(5R,8S,10S)-特古利德2-溴苯酸酯[1,1-二乙基-3-(6-甲基-8-异麦角酚基)脲,顺式-双氢利舒瑞德]的X射线晶体结构测定得到确认。