STUDIES ON THE CHEMISTRY OF HETEROCYCLICS. VIII. ENZYMATIC RESOLUTION OF RACEMIC β-2-THIENYLALANINE AND PREPARATION OF SOME SUBSTITUTED β-2-THIENYLALANINES<sup>1</sup>
作者:BERNARD F. CROWE、F. F. NORD
DOI:10.1021/jo01149a040
日期:1950.5
Improved Preparation of Racemic 2-Amino-3-(heteroaryl)propanoic Acids and Related Compounds Containing a Furan or Thiophene Nucleus
noic acids (1), mostly with a furan or thiophene nucleus as a heteroaryl group, were synthesized in 48-94% yield by the reduction of 3-(heteroaryl)-2-(hydroxyimino)propanoic acids (5) with zinc dust and formic acid in the presence of a catalytic amount of iron dust at 60 degrees C for 2 h. Under these conditions, unfavorable hydrogenolysis of bromine on the thiophene nucleus does not occur. Traditional