Vilsmeier-Type Reaction of Dimethylaminoalkenoyl Cyclopropanes: One-Pot Access to 2,3-Dihydrofuro [3,2-<i>c</i>]pyridin-4(5<i>H</i>)-ones
作者:Peng Huang、Ning Zhang、Rui Zhang、Dewen Dong
DOI:10.1021/ol203124f
日期:2012.1.6
A dominoreaction of readily available 1-carbamoyl-1-dimethylaminoalkenoylcyclopropanes in the presence of triflic anhydride (Tf2O) in N,N-dimethylformamide (DMF) is described, which provides a facile one-pot access to 2,3-dihydrofuro[3,2-c]pyridin-4(5H)-ones via tandem formylation (Vilsmeier-type reaction), intramolecular cyclization, and ring-enlargement sequences.
描述了在三氟甲磺酸酐(Tf 2 O)存在下于N,N-二甲基甲酰胺(DMF)中容易获得的1-氨基甲酰基-1-二甲基氨基链烯酰基环丙烷的多米诺反应,该反应可轻松地一锅获得2,3-二氢呋喃[3,2 - c ] pyridin-4(5 H)-通过串联甲酰化反应(Vilsmeier型反应),分子内环化和环扩大序列。
Lawesson's reagent-initiated domino reaction of aminopropenoyl cyclopropanes: synthesis of thieno[3,2-c]pyridinones
作者:Peng Huang、Rui Zhang、Yongjiu Liang、Dewen Dong
DOI:10.1039/c2ob06709a
日期:——
substituted 2,3-dihydrothieno[3,2-c]pyridin-4(5H)-ones has been developed and relies upon a dominoreaction of dimethylaminopropenoyl cyclopropanes initiated by Lawesson's reagent. A mechanism involving regioselective thionation, ring-enlargement, and an intramolecular aza-cyclization sequence is proposed. This protocol was utilized as a one-pot route to thieno[3,2-c]pyridin-4(5H)-ones with DDQ as an oxidant
已经开发了一种方便有效的取代的2,3-二氢噻吩并[3,2- c ]吡啶-4(5 H)-one的合成方法,该方法依赖于二甲基氨基丙烯酰基Lawesson试剂引发的环丙烷。一种机制,涉及区域选择性硫磺化,环扩大和分子内氮杂提出了环化顺序。该协议被用作通向噻吩并[3,2 - c ]吡啶-4-4 (5 H)-的一锅法。DDQ 作为氧化剂。
Phenyliodine(III) Diacetate Mediated Oxidative Cyclization of 1-Alkenoyl-1-carbamoyl Cycloalkanes: Access to Spiro-Fused Dihydrofuran-3(2<i>H</i>)-ones
Facile and efficient synthesis of spiro-fused dihydrofuran-3(2H)-ones was developed via phenyliodine(III) diacetate (PIDA) mediated oxidative cyclization of 1-alkenoyl-1-carbamoyl cycloalkanes under very mild conditions.