Constrained cycloalkyl analogues of glutamic acid: stereocontrolled synthesis of (+)-2-aminobicyclo[3.1.0]hexane-2,6-dicarboxylic acid (LY354740) and its 6-phosphonic acid analogue
作者:Jerzy Krysiak、Wanda H. Midura、Wanda Wieczorek、Lesław Sieroń、Marian Mikołajczyk
DOI:10.1016/j.tetasy.2010.04.051
日期:2010.6
yield of 27% starting from the enantiopure (+)-(R)-2-(p-tolylsulfinyl)cyclopent-2-enone 3. The key steps include asymmetric cyclopropanation of 3 with (dimethylsulfuranylidene)acetate (EDSA) and removal of the chiral p-tolylsulfinyl auxiliary from the cycloadduct ent-4c upon treatment with iso-propylmagnesium chloride. The stereoselective hydantoin formation from the bicyclic ketone 6 formed (Bucherer–Bergs
新的立体控制合成的(+)-2-氨基双环[3.1.0]己烷-2.6-二羧酸(LY354740)1是一种有效的,选择性的2mGluR激动剂,从四个步骤开始,总收率从27%开始对映体(+)-(R)-2-(对-甲苯基亚磺酰基)环戊-2-烯酮3。的关键步骤包括的不对称环丙烷3与(dimethylsulfuranylidene)乙酸乙酯(EDSA)和除去手性的p从环加成-tolylsulfinyl辅助ENT -图4c在与治疗异-propylmagnesium酰氯。由双环酮6形成的立体选择性乙内酰脲形成(Bucherer-Bergs反应),随后水解完成1的合成。相同的反应顺序已应用于对映体纯(+)-2-氨基-6-膦酰基双环[3.0.1]己烷-2-羧酸2的第一次合成中,该结构为1的结构6-膦酰基类似物。起始的双环酮膦酸酯9-11是通过(-)-(S)-3与磷酰基sulf的不对称环丙烷化反应制得的,仅产生两种