Synthesis of 5-alkylidene-2,5-dihydropyrrol-2-ones and their ring-transformation into 5,6-dihydrobenzo[h]chromones, 5,6,7,8-tetrahydrochromones and pyran-4-ones
Acid-mediated ring-transformations of 5-alkylidene-2,5-dihydropyrrol-2-ones, available by cyclization of 1,3-diketone dianions with bis(imidoyl) dichlorides of oxalic acid, resulted in formation of functionalized pyran-4-ones, such as 5,6-dihydrobenzo[h]c
Nguyen, Van T.H.,Anders, Joachim T.,Ma, Qingjun,Herbst-Irmer, Regine,Langer, Peter
p. 12975 - 12985
(2008/03/27)
Efficient synthesis of functionalized 2-carbamoylpyran-4-ones by ring-transformation of 5-alkylidene-2,5-dihydropyrrol-2-ones
Functionalized 2-carbamoylpyran-4-ones were prepared by acid-mediated ring-transformations of readily available 5-alkylidene-3-arylamino-2,5- dihydropyrrol-2-ones.
Anders, Joachim T.,Nguyen, Van Thi Hong,Langer, Peter
p. 2779 - 2781
(2007/10/03)
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