Aliphatic chain-containing macrocycles as diazonamide A analogs

liphatic alkyl chain-containing 12–14-membered macrocycles have been designed as structural analogs of antimitotic natural product diazonamide A. Macrocycles were synthesized from 5-bromooxazole in 7 to 9 linear steps using Ru-catalyzed ring-closing metathesis as the key transformation. Heat effect of binding to α,β-tubulin tetramer (T4-RB3 complex) has been measured for the synthesized macrocycles by isothermal titration calorimetry method.