Asymmetric conjugate reductions with samarium diiodide: asymmetric synthesis of (2S,3R)- and (2S,3S)-[2-<sup>2</sup>H,3-<sup>2</sup>H]-leucine-(S)-phenylalanine dipeptides and (2S,3R)-[2-<sup>2</sup>H,3-<sup>2</sup>H]-phenylalanine methyl ester
作者:Stephen G. Davies、Humberto Rodríguez-Solla、Juan A. Tamayo、Andrew R. Cowley、Carmen Concellón、A. Christopher Garner、Alastair L. Parkes、Andrew D. Smith
DOI:10.1039/b500566c
日期:——
diastereoselective samarium diiodide and D(2)O-promoted conjugate reduction of homochiral (E)- and (Z)-benzylidene and isobutylidene diketopiperazines (E)-5,7 and (Z)-6,8 has been demonstrated. This methodology allows the asymmetricsynthesis of methyl (2S,3R)-dideuteriophenylalanine 27 in > or = 95% de and >98% ee, and (2S,3R)- or (2S,3S)-dideuterioleucine-(S)-phenylalanine dipeptides 37 and 38 in moderate de,