65638-74-6Relevant articles and documents
Enantioselective Rh-catalyzed hydrogenation of N-formyl dehydroamino esters with monodentate phosphoramidite ligands
Panella, Lavinia,Aleixandre, Alicia Marco,Kruidhof, Gerlof J.,Robertus, Jort,Feringa, Ben L.,De Vries, Johannes G.,Minnaard, Adriaan J.
, p. 2026 - 2036 (2007/10/03)
Enantioselectivities up to >99% ee were achieved in the rhodium-catalyzed asymmetric hydrogenation of N-formyl dehydroamino esters using monodentate phosphoramidites as chiral ligands. The substrates were synthesized by condensation of methyl isocyanoacetate with a range of aldehydes and with cyclohexanone. A highly convenient multigram scale one step synthesis of methyl 2-(formamido)acrylate was developed. This compound was used in the synthesis of methyl 2-(formamido)cinnamate via a solvent free Heck reaction. Moreover, full conversion and >99% ee were obtained in 1 h in the hydrogenation of methyl 2-(formamido)acrylate with 0.2 mol% catalyst and 2 bar hydrogen pressure. The versatility of the formyl protection was established by its removal under mild conditions.
SYNTHESIS OF Β-FUNCTIONALIZED α,β-DEHYDROAMINO ACID DERIVATIVES
Nunami, Ken-ichi,Hiramatsu, Kiwamu,Hayashi, Kimiaki,Matsumoto, Kazuo
, p. 5467 - 5478 (2007/10/02)
β-functionalized α,β-unsaturated amino acids were synthesized by an addition-elimination pathway.Reaction of methyl β-bromo-α-formylaminoacrylates ( 3a-e ), which were prepared by the condensation of methyl isocyanoacetate ( 1 ) with aldehydes followed by