New and Practical Method for Synthesis of 1- and 1,3-Substituted Xanthines
作者:Ilia A. Zavialov、Vilas H. Dahanukar、Hoa Nguyen、Cecilia Orr、David R. Andrews
DOI:10.1021/ol049272n
日期:2004.6.1
[reaction: see text] A new and practical method for the synthesis of 1- and 1,3-substituted xanthines is reported. Direct base-promoted condensation of the imidazole precursor 1 with carbamates 2 gives 1-substituted 7-PMB xanthines 7 in good yields. Alkylation of these derivatives or their potassium salts proceeds under mild conditions to give functionalized 1,3-substituted 7-PMB xanthines 9 in good