Jh. Tao et Rv. Hoffman, A STEREOCONTROLLED, CONVERGENT SYNTHESIS OF OF HYDROXYETHYLENE DIPEPTIDE ISOSTERES, Journal of organic chemistry, 62(18), 1997, pp. 6240-6244
A simple, convergent, and stereoselective synthesis of hydroxyethylene
dipeptide isosteres 1 and 2 from scalemic alpha-hydroxy esters has be
en developed. The method is short (six steps), efficient (approximate
to 15-25% overall), and highly diastereoselective (86-94% de) and enan
tioselective (> 95% ee).