Synthesis of Phosphonate Isosteres of 2‘-Deoxy-1‘,2‘-seco-nucleotides
摘要:
Practical and convergent syntheses of 2'-deoxy-1',2'-seco-nucleophosphonates and 1',2'-seco-nucleophosphonates are described. Phosphonate chirons derived from D-isoascorbic acid were used in alkylation of functionalized nucleobases to provide the title phosphonate isosteres in good yields. Subsequent deprotection and deesterification led to the 5'-C-methylenephosphonic acids which were conveniently purified using gravity flow C-18 reverse phase column chromatography.
A general and facile synthesis of .beta.- and .gamma.-hydroxy phosphonates from epoxides
摘要:
A practical and facile method for the preparation of hydroxy phosphonate esters is described. Regiospecific ring opening of monosubstituted epoxides by phosphorus and carbon nucleophiles, derived from diethyl phosphite and methanephosphonates, in the presence of BF3.OEt2 furnishes the corresponding beta- and gamma-hydroxy phosphonates, respectively. Ketals, bromides, sulfonate esters, and carbamates (compounds 12, 13, 15, 16, and 18) are stable under the reaction conditions, but benzoate esters(14) behave differently. While they survive phosphite nucleophilicity, they are cleaved by phosphonates. Several chirons (2, 28a, 30b, and 31) for the synthesis of phosphonate isosteres of nucleotides and phospholipids are also described.
Synthesis of Phosphonate Isosteres of 2‘-Deoxy-1‘,2‘-seco-nucleotides
作者:Hussein I. El-Subbagh、Saibaba Racha、Elie Abushanab、Raymond P. Panzica
DOI:10.1021/jo951701v
日期:1996.1.1
Practical and convergent syntheses of 2'-deoxy-1',2'-seco-nucleophosphonates and 1',2'-seco-nucleophosphonates are described. Phosphonate chirons derived from D-isoascorbic acid were used in alkylation of functionalized nucleobases to provide the title phosphonate isosteres in good yields. Subsequent deprotection and deesterification led to the 5'-C-methylenephosphonic acids which were conveniently purified using gravity flow C-18 reverse phase column chromatography.
A general and facile synthesis of .beta.- and .gamma.-hydroxy phosphonates from epoxides
A practical and facile method for the preparation of hydroxy phosphonate esters is described. Regiospecific ring opening of monosubstituted epoxides by phosphorus and carbon nucleophiles, derived from diethyl phosphite and methanephosphonates, in the presence of BF3.OEt2 furnishes the corresponding beta- and gamma-hydroxy phosphonates, respectively. Ketals, bromides, sulfonate esters, and carbamates (compounds 12, 13, 15, 16, and 18) are stable under the reaction conditions, but benzoate esters(14) behave differently. While they survive phosphite nucleophilicity, they are cleaved by phosphonates. Several chirons (2, 28a, 30b, and 31) for the synthesis of phosphonate isosteres of nucleotides and phospholipids are also described.