WENGEL, JESPER;LAU, JESPER;PEDERSEN, ERIK B., SYNTHESIS,(1989) N1, C. 829-832
作者:WENGEL, JESPER、LAU, JESPER、PEDERSEN, ERIK B.
DOI:——
日期:——
A Convenient Method for the Synthesis of L-3′-Amino-2′,3′-dideoxyuridines
作者:Jesper Wengel、Jesper Lau、Erik B. Pedersen
DOI:10.1055/s-1989-27403
日期:——
(2E,4R)-4-Acetoxy-5-hydroxy-2-pentenal (3) was synthesized from L-arabinose (1) via 3,4-di-O-acetyl-L-arabinal (2). Phthalimide as its 1,8-diazabicyclo[5.4.0]undec-7-ene salt was coupled to 3 at C-3 to give an anomeric mixture of 2,3-dideoxy-3-phthalimido-L-erythro-pentofuranose, which was acetylated to give the corresponding di-O-acetyl derivative 4. Reaction of 4 with silylated 2,4-dihydroxypyrimidines 5 in the presence of trimethylsilyl triflate as catalyst afforded the nucleosides 6 and 7. The pure β-anomers obtained by fractional crystallization were deprotected with 33% methylamine in absolute ethanol to give the corresponding L-3′-aminonucleosides 8. After fractional crystallization of 6c the pure α-anomer 7c was obtained from the mother liquid and deprotected to give the corresponding L-3′-aminonucleoside 9c.