The developments of theoretical studies on NHC‐catalyzed [n+ 2](n= 2, 3, 4) and other
cycloaddition/annulation reactions have been summarized in this review. The detailed …

An N-heterocyclic carbene (NHC)-catalyzed formal [4+ 2] synthesis of dihydrocoumarins
was realized from saturated carboxylic acids and o-quinone methides via an in situ …

An N-heterocyclic carbene (NHC) catalyzed γ-specific aldol-like reaction between
allenoates and isatins has been achieved under mild conditions, giving trisubstituted allene …

The reaction of electrophilic 2-(dicyanomethylene) indan-1, 3-dione (DCID) with substituted,
electron-rich alkynes provides two classes of push–pull chromophores with interesting …

An NHC-catalyzed hetero-Diels–Alder and isomerization process of chalcones with
allenoates was discovered, which furnished highly functionalized multisubstituted pyranyl …

Structurally fused heterocycles encompassing 4H‐pyran centerpiece are prevalent scaffolds
with promising biological activities, but have daunting synthetic challenges. Herein, we …

An N-heterocyclic carbene (NHC)-catalyzed reaction of γ-substituted allenoates for the
synthesis of substituted oxetanes has been developed. The method provides an approach to …

Abstract Regioselective [3+ 3] annulation of alkynyl ketimines with α‐cyano ketones for the
synthesis of polysubstituted 4H‐pyran derivatives with a quaternary CF3‐containing center …

Lewis base N-heterocyclic carbene (NHC)-catalyzed annulation is the subject of extensive
interest in synthetic chemistry, but the reaction mechanisms, especially the unexpected …

The synthesis of polysubstituted 4H-pyran derivatives has attracted considerable attention
due to its wide application in agrochemicals, pharmaceuticals, and other functional …