Inclusion of aliphatic alcohols in pockets of ( S)-threonyl-( S)-phenylglycine using grinding method

Abstract

Inclusion compounds of a dipeptide, ( S)-threonyl-( S)-phenylglycine (Thr-Phg), with several aliphatic alcohols were easily prepared by grinding them in a mortar. Thr-Phg molecules arranged in antiparallel to construct a sheet, and guest alcohols were accommodated in a chiral pocket between the sheets. 3-Butyn-2-ol and 2-butanol were included with moderate enantioselectivity, 57% ee ( R) and 49% ee ( R), respectively. The role of the hydroxy group of Thr-Phg is not only to construct the unique pocket but also to capture guest alcohols by hydrogen bonding.