Phosphate monoesters are synthesized from a mixture of phosphoricacid (1 or 2 equiv) and alcohols (1 equiv) in the presence of tributylamine. The reaction is promoted by nucleophilic bases such as N-alkylimidazole and 4-(N,N-dialkylamino)pyridine. 2',3'-O-Isopropylidene ribonucleosides are selectively converted to their 5'-monophosphates without the protection of amino groups in nucleobases.
used in the preparation and characterization of sundry steroid phosphate and phosphonate esters, as well as some P1,P2-disteroid pyrophosphates. An attempt to prepare cholest-3,5-dien-3-yl dialkyl phosphate by a vinylogous Perkow reaction from 6-bromocholest-4-en-3-one yielded only dienenones. As a model for P1,P2-disteroid pyrophosphate (and steroid phosphate) behavior in solution, the neutral crystalline
Studies of organophosphorochloridates. Part II. Reactions of steroid phosphorodichloridates
作者:R. J. W. Cremlyn、N. A. Olsson
DOI:10.1039/j39710002023
日期:——
The preparation of the following steroid phosphorodichloridates is described: cholestanyl, epicholestanyl, epicholesteryl, and the derivatives of methyl 3α-hydroxy-5β-chlolanate, and ergosta-8(14)en-3β-ol. The formation of the phosphorodichloridates was followed by t.l.c. Attempted phosphorylation of 3,5-cyclocholestan-6β-ol, and 6β-hydroxycholest-4-en-3-ol gave cholesteryl phosphorodichloridate and