An efficient one-pot methodology for the synthesis of pyrazolo[3,4-d]pyrimidines was developed by using 5-aminopyrazoles with formamide in presence of PBr3 as the coupling agent. Among the examples presented in this work, compounds 41 and 54-56 with phenyl or 2-quinolinyl groups at N-1 and p-Me-Ph, p-Cl-Ph, or p-OMe-Ph group at C-3 position in the pyrazole ring possessed better potency against NCl-H226 and NPC-TW01 cancer cells with GI(50) values between 18 mu M and 39 mu M. (c) 2012 Elsevier Ltd. All rights reserved.
Selective synthesis of pyrazolo[3,4-d]pyrimidine, N-(1H-pyrazol-5-yl)formamide, or N-(1H-pyrazol-5-yl)formamidine derivatives from N-1-substituted-5-aminopyrazoles with new Vilsmeier-type reagents
作者:Chun-Hsi Chang、Henry J. Tsai、Yu-Ying Huang、Hui-Yi Lin、Li-Ya Wang、Tian-Shung Wu、Fung Fuh Wong
DOI:10.1016/j.tet.2012.11.002
日期:2013.1
N-1-(2-pyridinyl)-5-aminopyrazoles, and N-1-(2-quinolinyl)-5-aminopyrazoles with these agents gave the corresponding pyrazolo[3,4-d]pyrimidine, N-(1H-pyrazol-5-yl)formamide, or N-(1H-pyrazol-5-yl)formamidine. The reaction was different from the traditional Vilsmeier-type reaction and the plausible reactive pathways were proposed for the unexpected result.
从甲酰胺或N-甲基甲酰胺与POCl 3合成了多种新型的Vilsmeier试剂卤代甲基亚铵盐。的治疗Ñ -1-取代的氨基吡唑包括Ñ -1-苯基-5-氨基吡唑,Ñ -1-(2-吡啶基)-5-氨基吡唑,和Ñ -1-(2-喹啉基)-5-氨基吡唑与这些剂得到相应的吡唑并[3,4- d ]嘧啶,N-(1 H-吡唑-5-基)甲酰胺或N-(1 H-吡唑-5-基)甲idine。该反应不同于传统的Vilsmeier型反应,并提出了可能的反应途径以取得意想不到的结果。