Structure–activity relationship of ortho- and meta-phenol based LFA-1 ICAM inhibitors

Abstract LFA-1 ICAM inhibitors based on ortho- and meta- phenol templates were designed and synthesized by Mitsunobu chemistry. The selection of targets was guided by X-ray co-crystal data, and led to compounds which showed an up to 30-fold increase in potency over reference compound 1 in the LFA-1/ICAM1-Ig assay. The most active compound exploited a new hydrogen bond to the I-domain and exhibited subnanomolar potency.