Surprising reactivity of (methyl 2-acetamidoacrylate)tricarbonyliron(0) leading to the synthesis of β,β,β-trialkyl α-amino acids
作者:James Barker、Stephen L. Cook、M. Elena Lasterra-Sánchez、Susan E. Thomas
DOI:10.1039/c39920000830
日期:——
Addition of methyllithium followed by tertiary haloalkanes to readily available and air-stable (methyl 2-acetamidoacrylate)tricarbonyliron(0)1, gives protected β,β,β-trialkyl α-amino acids which are hydrolysed to give tert-leucine 10 and the new α-amino acids 2-amino-3,3-dimethylpentanoic acid 11 and 2-amino-3,3-dimethylhexanoic acid 12.
after about 50% conversion, this being catalyzed by a protease from Bacillus licheniformis (Alcalase), and subsequent acidic saponification of the recovered ester. Among the methyl, ethyl, octyl, chloroethyl and trichloroethyl esters, the chloroethyl ester exhibited the highest rate of hydrolysis.