Gold(I)-catalyzed heteroannulation affords the efficient and straightforward construction of heterocyclic compounds. Herein, we developed a gold(I)-catalyzed heteroannulation of salicylic amides with alkynes producing a broad range of 1,3-benzoxazin-4-ones. The utility of this protocol was highlighted by synthesizing variously substituted benzoxazinones containing quaternary carbon centers, showing
The Condensation of Salicylamide with Aldehydes and Ketones
作者:Bruce W. Horrom、Harold E. Zaugg
DOI:10.1021/ja01158a019
日期:1950.2
Wachi, Kazuyuki; Terada, Atsusuke, Chemical and pharmaceutical bulletin, 1980, vol. 28, # 2, p. 465 - 472
作者:Wachi, Kazuyuki、Terada, Atsusuke
DOI:——
日期:——
A new amine catalyzed synthesis of 2-substituted 2,3-dihydro-4H-1,3-benzoxazin-4-ones
作者:Ronald B. Gammill
DOI:10.1021/jo00329a041
日期:1981.7
The Vilsmeier–Haack formylation of 2,3-dihydro-4H-1,3-benzoxazin-4-ones and isomeric 1,2-dihydro-4H-3,1-benzoxazin-4-ones: an effective approach to functionalized 2H-/4H-chromenes and tetrahydroacridines
作者:Oleg K. Farat、Victor I. Markov、Svetlana A. Varenichenko、Victor V. Dotsenko、Alexander V. Mazepa
DOI:10.1016/j.tet.2015.06.069
日期:2015.8
We found that 1,3- and isomeric 3,1-benzoxazin-4-ones react with the Vilsmeier reagent in vastly different ways. Thus, either 2H- or 4H-chromenes were obtained in good yields when 1,3-benzoxazin-4-ones were reacted at 75-80 degrees C, while the formylation of 3,1-benzoxazines at ambient temperature leads to acridine-9-one or 9-chloroacridine derivatives, depending on the amount of Vilsmeier reagent and the nature of substrate. (C) 2015 Elsevier Ltd. All rights reserved.