(R,R)-Threoninol was prepared in one step from l-threonine in 86% isolated yield. The product was regioselectively transformed into 2,2-bis[(4R,5R)-4-(hydroxymethyl)-5-methyl-1,3-oxazolin -2-yl]propane in 42% isolated yield. ... (R,R)-Threoninol was prepared in one step from l-threonine in 86% isolated yield. The product was regioselectively transformed into 2,2-bis[(4R,5R)-4-(hydroxymethyl )-5-methyl-1,3-oxazolin-2-yl]propane in 42% isolated yield. ... Amino alcohols constitute ...