A facile and efficient synthesis of substituted dihydropyridone–BF2 complexes is developed via intramolecularcyclization of α-acyl acrylamides and α-acyl cinnamamides mediated by BF3·Et2O.
A facile and efficient synthesis of substituted indeno[2,1-c]quinolin-6(7H)-ones from a variety of α-acyl N-arylcinnamamides mediated by polyphosphoric acid (PPA) is described, and a mechanism involving the formation of a dicationic superelectrophile and subsequent double intramolecular nucleophilic cyclization reactions is proposed.
描述了一种由多磷酸(PPA)介导的多种α-酰基N-芳基肉桂酰胺轻松高效地合成取代茚并[2,1 - c ]喹啉-6(7 H)-的方法,其中涉及到形成机理提出了一种超亲电性和随后的双重分子内亲核环化反应的方法。
Triflic Anhydride Promoted Intramolecular Cyclization of N-Aryl Cinnamides: Access to Polysubstituted Quinolin-2(1H)-ones
Abstract A facile and efficient synthesis of polysubstituted quinolin-2(1H)-ones is developed via intramolecular cyclization of readily available N-aryl cinnamides promoted by triflic anhydride in N,N-dimethyl trifluoroacetamide (DTA) under mild conditions. A facile and efficient synthesis of polysubstituted quinolin-2(1H)-ones is developed via intramolecular cyclization of readily available N-aryl
Synthesis of benzo[c][2,7]naphthyridine-6-ones via cascade aromatization/C(sp2)–H amidation of 1,4-dihydropyridines
作者:Laichun Luo、Qiang Wang、Xiaozhi Peng、Chunling Hu、Hong Wang
DOI:10.1016/j.tetlet.2017.06.009
日期:2017.7
A K2S2O8-mediated cascade dehydrogenative aromatization/intramolecularC(sp2)–Hamidation of 1,4-dihydropyridines is described. This method provides an efficient access to multisubstituted benzo[c][2,7]naphthyridine-6-ones in 38–74% yields.
描述了AK 2 S 2 O 8介导的1,4-二氢吡啶的级联脱氢芳构化/分子内C(sp 2)-H酰胺化。该方法可有效获得多取代的苯并[ c ] [2,7]萘啶-6-酮,产率为38-74%。
Copper-Nitrene Triggered Annulation of α-Acyl Cinnamides: Access to Isoxazol-3(2<i>H</i>
)-ones
A facile and efficient one‐potsynthesis of isoxazol‐3(2H)‐ones has been developed starting fromα‐acyl cinnamides and tosyliminophenyliodinane catalyzed by copper(II) acetate [Cu(OAc)2] under very mild conditions involving a tandem aza‐Michael addition and intramolecular cyclization sequence.