352541-83-4Relevant academic research and scientific papers
Synthesis of a bicyclic analogue of AZT restricted in an unusual O4′-endo conformation
Sorensen,Nielsen,Nielsen
, p. 4878 - 4886 (2007/10/03)
The [3.2.0]bicyclic β-nucleoside analogue 5 has been designed as a conformationally restricted analogue of the anti-HIV drug AZT. The synthesis of 5 as well as its α-anomer 29 is hereby described. The synthesis was accomplished from D-arabinose via a modified Corey-Link procedure stereo-selectively incorporating the azide moiety as well as a methyl ester function. When the tertbutyldiphenylsilyl group was used as a permanent protecting group, a selective formation of an oxetane ring failed. When using the p-methoxyphenyl group as a permanent protecting group, 5 and 29 were efficiently obtained via a selective reduction of the ester, a nucleobase coupling followed by separation of the anomers and ring-closing procedures. The nucleoside 5 is conformationally restricted in an unusual O4′-endo (East) conformation, which is an intermediate between the North- and South-type conformations. Nevertheless, neither 5 nor 29 displayed any anti-HIV activity.
