Syntheses of New Phosphono Analogues of Pantetheine DerivativesThe phosphono analogues5and13of pantothenate 4′‐(dibenzyl phosphate) and pantetheine 4′‐(dibenzyl phosphate), respectively, are prepared as intermediates for the synthesis of a coenzyme‐A phosphono analogue (Schemes 1and2). The synthesis of phosphono analogues20and21of oxapantetheine, which are structurally similar compounds to the phosphono analogue of pantetheine, is also described (