An iron(III)-catalyzed one-potthree-component cross-coupling nitration reaction of 2-aminopyridines, aldehydes and nitroalkanes, straightforwardly forms imidazo[1,2-a]pyridinederivatives and is described in this report. The system shows good functional-group tolerance and proceeds smoothly in moderate to good yields.
Synthesis of α-heterosubstituted ketones through sulfur mediated difunctionalization of internal alkynes
作者:Zhong Zhang、Yuzheng Luo、Hongguang Du、Jiaxi Xu、Pingfan Li
DOI:10.1039/c9sc00568d
日期:——
Synthesis of α-heterosubstituted ketones was achieved through sulfur mediated difunctionalization of internal alkynes in one pot. The reaction design involves: phenyl substituted internal alkyne attacking triflic anhydride activated diphenyl sulfoxide to give a sulfonium vinyl triflate intermediate, hydrolysis to give an α-sulfonium ketone, and then substitution with various nucleophiles. This method
synthesized and their antiinflammatory activities toward NLRP3 (nucleotide-binding domain leucine-rich repeat containing protein family,pyrin domain-containing 3,also known as cryopyrin or NALP3) inflammasome were evaluated in vitro. Two lead compounds, TBZ-09 and TBZ-21, were identified by antiproduction of IL-1β. In the second round of biological evaluation, based on the lead, 34 more compounds were synthesized
An efficient, one-pot, three-component domino strategy has been demonstrated for the synthesis of imidazo[1,2-a]pyridines using a catalytic amount of Fe(III) chloride in high yields in air. A library of imidazo[1,2-a]pyridines was synthesized by the reaction of easily available aldehydes and 2-aminopyridines in a mixture of nitroalkane and DMF (2:1). This transformation presumably occurs by a sequential
已经证明了一种有效的单锅三组分多米诺骨牌策略,该策略用于在空气中高产率地使用催化量的氯化Fe(III)合成咪唑并[1,2- a ]吡啶。通过使易得的醛与2-氨基吡啶在硝基烷和DMF(2:1)的混合物中反应,合成了咪唑并[1,2- a ]吡啶文库。该转化大概是通过顺序的氮杂-亨利反应/环化/脱硝而发生的。使用容易获得的化学品作为起始原料,廉价的金属催化剂,好氧反应条件,宽泛的官能团耐受性和操作简便性是本方案的显着优势。