coupled to protected pteroic acid to give 1 in two steps in 47% yield. N τ-(Functionalized aminoalkyl)histidine was synthesized by two different routes. The preferred route starting from Boc-His-OMe led in two steps to the N τ-(functionalized aminoalkyl)histidine in 36% yield. alkylations - amino acids - regioselectivity - organometallic - receptor