Diallyl N,N-diisopropylphosphoramidite was employed as a phophorylating reagent. It can be used for reactions involved in phosphitylation of alcohols, deallylation for the synthesis of nucleoside phosphoramidite, posphitylation and stereoselective pudovik rearrangement. It can be used for preparation of peptide substrates, rhodamine dyes with phosphorylated CH2OH sites, and 3-[4-(bis-allyloxy- phosphoryloxy)-2(R)-hydroxy-3,3-dimethyl-butyrylamino]-thiopropionic acid-S-propylester and so on. It also involved in the synthesis of pharmacologically active molecules including selective orally active S1P1 agonists, water-soluble prodrugs of triazole CS-758 with antifungal activity, and fostriecin analogs as antitumor agents, and so on