【摘 要】
:
An efficient synthesis of functionalized 4H-chromenes by the tandem reaction of b,g-unsaturated aketoesters with 2-naphthols,1-naphthols,and 1,3-dihydroxynaphth
【机 构】
:
School of Marine Science and Technology,Harbin Institute of Technology at Weihai,Beijing National La
【出 处】
:
Chinese Chemical Letters
论文部分内容阅读
An efficient synthesis of functionalized 4H-chromenes by the tandem reaction of b,g-unsaturated aketoesters with 2-naphthols,1-naphthols,and 1,3-dihydroxynaphthalenes has been accomplished with high selectivity and excellent yields in the presence of a catalytic amount of bismuth triflate [Bi(OTf)3,5 mol%] under mild conditions.The functionalized 4H-chromene synthesis and our previous 2Hchromene hemiacetal synthesis could complement each other to enrich reaction diversity.
An efficient synthesis of functionalized 4H-chromenes by the tandem reaction of b, g-unsaturated aketoesters with 2-naphthols, 1-naphthols, and 1,3-dihydroxynaphthalenes has been accomplished with high selectivity and excellent yields in the presence of a catalytic amount of bismuth triflate [Bi (OTf) 3,5 mol%] under mild conditions. The functionalized 4H-chromene synthesis and our previous 2Hchromene hemiacetal synthesis could complement each other to enrich reaction diversity.
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