Regioselective synthesis of 1-allyl- and 1-arylmethyl uracil and thymine derivatives
作者:Vaishali Malik、Palwinder Singh、Subodh Kumar
DOI:10.1016/j.tet.2005.02.047
日期:2005.4
in the presence of I2 regioselectively provide 1-allyl-/1-arylmethyl-uracil and thyminederivatives. The secondary aryl alkyl and diaryl methyl halides with 1 provide chiral 1-arylalkyl/1-(diarylmethyl) uracil/thyminederivatives. The procedure has been extended to the synthesis of fluorescent uracil/thyminederivatives.
Unique chlorine effect in regioselective one-pot synthesis of 1-alkyl-/allyl-3-(o-chlorobenzyl) uracils: anti-HIV activity of selected uracil derivatives
作者:Vaishalli Malik、Palwinder Singh、Subodh Kumar
DOI:10.1016/j.tet.2006.04.018
日期:2006.6
2,4-Bis(trimethylsilyloxy)pyrimidines 1/2 on reaction with o-chlorobenzyl chlorides in 1,2-dichloroethane in the presence Of 12 undergo single step 1,3-dibenzylation to provide 1, 3 -bis(o-chlorobenzyl)pyrimidine-2,4-diones. The reactions of I with allyl/alkyl bromide followed by subsequent addition of o-chlorobenzyl chloride provide a simple one-pot synthesis of 1,3-unsymmetrical pyrimidine-2,4-diones. Amongst these, 1,3-bis(o-chlorobenzyl)uracil (6a) shows anti-HIV-1 activity. (c) 2006 Elsevier Ltd. All rights reserved.