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。
PIFA/TEMPO‐Mediated Oxidative Cascade Cyclization of
<i>α</i>
‐[(
<i>β</i>
‐Amino)propenoyl]‐Alkylamides: Access to Polysubstituted 3,7‐Dihydrooxazolo[4,5‐
<i>c</i>
]pyridine‐2,4,6(5
<i>H</i>
)‐triones
bis(trifluoroacetate) (PIFA) and 2,2,6,6‐tetramethyl piperidin‐1‐oxyl (TEMPO) has been described. This unprecedented transformation features mild reaction conditions, simple execution, high chemo‐ and regio‐selectivity, and thereby provides a facile and efficient protocol for the synthesis of polysubstituted 3,7‐dihydro‐ oxazolo[4,5‐c]pyridine‐2,4,6‐(5H)‐triones.
苯基碘(III)双(三氟乙酸)(PIFA)和2,2,6,6-四甲基哌啶-1-氧基(TEMPO)介导的α -[[(β-氨基)丙烯酰基]-烷基酰胺的新型氧化级联环化已经描述过了。这种前所未有的转化具有温和的反应条件,简单的操作,较高的化学和区域选择性,从而为合成多取代的3,7-二氢恶唑[4,5 - c ]吡啶-2提供了简便而有效的方案, 4,6-(5 H)-三酮。