The Hydrolysis of Disubstituted Alkyl Phosphorochloridates and <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetra-stibstituted Phosphorodiamidic Chlorides in Water and Deuterium Oxide: Heat Capacity of Activation and Kinetic Solvent Isotope Effects
作者:E. C. F. Ko、R. E. Robertson
DOI:10.1139/v73-090
日期:1973.2.15
alkyl-phosphorochloridates, where the alkyl group is ethylisopropyl and n-propyl; for tetra-methyl and tetra-ethyl phosphorodiamidic chlorides; the di-n-propyl and di-isopropyl analog, the di(isopropylmethylcarbinyl)phosphorochloridate and the tetra-ethylthiophosphorodiamidic chloride. These compounds have a potential relationship to compounds used as insecticides and as polymers. The mechanism of reaction
<i>N</i>,<i>N</i>′-Dialkyldiamide-Type Phosphate Protecting Groups for Fmoc Synthesis of Phosphotyrosine-Containing Peptides: Optimization of the Alkyl Group
Synthesis and evaluation of three Fmoc–phosphotyrosine derivatives with a phosphategroupprotected as N,N′-dialkyldiamide (alkyl = Prn, Pri, and Bui) were studied. All the derivatives were obtained as crystals, among which the Buiderivative (4c) was the best in ease of preparation and excellence in cleavage property. Solid phase synthesis of a methionine-containing peptide, H–Tyr(PO3H2)–Val–Pro–Met–Leu–OH
Z-Tyr[P(O)(NHR)2]-OBzl (R=n-Pr and i-Pr) were obtained by reactions of Z-Tyr-OBzl, lithiated with LDA, with N,N′-dipropyl- or diisopropyl-phosphorodiamidic chloride. Fmoc derivatives, Fmoc-Tyr[P(O)(NHR)2]-OH, were obtained from them as stable crystals. The PN bonds are stable toward 20% piperidine in DMF and were cleaved completely with 95% trifluoroacetic acid.