Substrate‐Controlled Regioselectivity Switch in a Three‐Component 1,3‐Dipolar Cycloaddition Reaction to Access 3,3′‐Pyrrolidinyl‐Spirooxindoles Derivatives
cycloaddition reaction of isatin-derived azomethine ylides with α-cyano-α,β-unsaturated compounds was developed, which enabled diversity-oriented synthesis of a series of novel and structurally complex 3,3′-pyrrolidinyl-spirooxindoles derivatives containing four contiguous and two quaternary stereogenic centers in high yields (up to 92%) and excellent diastereoselectivities (up to >25:1 dr). The reaction displays
Divergent Synthesis of Highly Substituted Tetrahydroquinolines and Cyclopentenes via Lewis Base Catalyzed Switchable [4 + 2] and [3 + 2] Annulations of MBH-Carbonates with Activated Olefins
A highly selective and divergent synthesis which enabled access to various complex compounds is highly attractive in organic synthesis and medicinal chemistry. Herein, we developed an effective method for divergent synthesis of highly substituted tetrahydroquinolines via Lewis base catalyzed switchable annulations of Morita–Baylis–Hillman carbonates with activated olefins. The reaction displayed switchable