Forty-six- and fifty-membered endo-functionalizedmacrocycles were obtained by template syntheses with new stiff tetracyclic tetraols 10 and 11. Reaction of dialkenylatedboronic acids 1 with template molecules 10 and 11 generated preorganized bisboronic esters 18 and 19, which were cyclized by ring-closing olefin metathesis. Resulting bimacrocycles 20 and 21 were obtained in ca. 60 % yield when alkenyl