Synthesis of 5,5′-dihydroxyleucine and 4-fluoro 5,5′-dihydroxyleucine, the reduction products of 4-carboxyglutamic and 4-carboxy-4-fluoroglutamic acids
作者:Joëlle Dubois、Christine Fourès、Sonia Bory、Serge Falcou、Michel Gaudry、Andrée Marquet
DOI:10.1016/s0040-4020(01)80939-x
日期:1991.1
Schemes for the synthesis of 5-5'-dihydroxyleucine 3 and its 4-fluoro analog 7 involving the condensation of a suitable ''aminoacid moiety'' with 2,2-dimethyl-5-iodomethyl-1,3-dioxane 15D or its fluoro analog 27A were tested. The anion of the ethyl N-diphenylmethylene-glycinate 25 gave better yields of 3 than the classical anion of diethyl acetamidomalonate. This strategy could not be successfully applied to the synthesis of 7, which could be prepared by reduction of a suitably protected 4-fluoro-4-carboxyglutamate with BMS.