Two complementary classes of chiral boron enolates for adaptation to aldol additions to resin-bound aldehydes were studied: (i) the thioester-derived enolate 1 bearing chiral ligands on boron, and (ii) the chiral ketone-derived enolate 2. The viability of performing highly enantioselective, boron-mediated, aldolreactions was demonstrated by the preparation of resin-bound adducts 15 (91% ee) and 21