Modified Chemoselective Reduction and Consecutive Regioselective Deuteration Reaction Catalyzed by B(C6F5)3

B(C6F5)3-Catalyzed Reductive Deoxygenation of Isatins for Indole Synthesis

An efficient method for reductive deoxygenation of isatin derivatives using catalyst B(C6F5)3 and methylphenylsilane is described. This reaction proceeds rapidly under mild conditions, and the protocol provides a broad substrate scope. Notably, while general synthetic methods utilizing a combination of B(C6F5)3 and hydrosilanes smoothly reduce indoles to generate indolines, the present strategy represents the first reductive deoxygenation reaction for the formation of indoles without further reduction.

Precise Synthesis of Diastereomers of Spiro-oxindole Derivatives through Dynamic Covalent Transformation

In this study, [1+2+2] cyclization of tryptamine-derived isocyanides with 3-ylideneoxindoles was systematically investigated. A series of structurally complex spiro-oxindole derivatives were obtained. Characteristic dynamic covalent chemistry was observed and confirmed by experiments and density functional theory calculation. Through the regulation of the solvent, temperature, and time, the precise and stereodivergent synthesis of spiro-oxindoles was achieved.