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 bicyclicketone 6 formed (Bucherer–Bergs