Ruthenium(II)-Catalyzed Regioselective Reductive Coupling of α-Imino Esters with Dienes
摘要:
A method for the highly regioselective reductive coupling reaction of N-aryl-alpha-imino esters with dienes is described. The method utilizes the RuHCI(CO)(PPh3)(3)/iPrOH catalytic system under an Ar atmosphere and provides alpha-branched allylic a-amino acid derivatives. Application of this transformation to the concise synthesis of a natural plant growth regulator is demonstrated.
Indium-Mediated Addition of γ-Substituted Allylic Halides to N-Aryl α-Imino Esters: Diastereoselective Production of β,β′-Disubstituted α-Amino Acid Derivatives with Two Contiguous Stereocenters
作者:Nayyar Ahmad Aslam、Vadla Rajkumar、Chennakesava Reddy、Makoto Yasuda、Akio Baba、Srinivasarao Arulananda Babu
DOI:10.1002/ejoc.201200254
日期:2012.8
γ-substituted allylic halides to N-aryl (including N-PMP) α-imino- and N-acylhydrazono esters and highly diastereoselective tailoring of functionalized γ,δ-unsaturated β,β′-disubstituted N-aryl α-amino acid derivatives, bearing two contiguous stereocenters is reported. Further N-allylation of the resulting γ,δ-unsaturated β,β′-disubstituted N-aryl amino acid derivatives followed by ringclosingmetathesis (RCM)
Chelation-controlled diastereoselective construction of N-aryl-, N-acyl/tosylhydrazono β-substituted aspartate derivatives via Barbier-type reaction
作者:Nayyar Ahmad Aslam、Srinivasarao Arulananda Babu、Arya Jayadev Sudha、Makoto Yasuda、Akio Baba
DOI:10.1016/j.tet.2013.05.130
日期:2013.8
involvement of a chelation-controlled TS. The synthesis of functionalized 1,4-diols, cis piperidine-2,3-dicarboxylate derivative and β-ethyl aspartic acid hydrochloride was performed using the N-substituted β-vinyl aspartates obtained in this work. The stereochemistry of representative products was unambiguously established from the single crystal X-ray structure analyses.