Facile Synthesis of Spirocyclic Oxindole Scaffolds via Intermolecular [4 + 1] Cycloaddition of ortho-Quinone Methides with 3-Chlorooxindoles.

This document provides detailed information about the synthesis and characterization of several compounds, specifically derivatives of spiro[benzofuran-2,3'-indolin]-2'-one. The compounds are described in terms of their physical properties, such as melting point and color, and their chemical structures are provided. The document includes data from nuclear magnetic resonance (NMR) and mass spectrometry (MS) analyses, as well as yield and diastereomeric ratio information for each synthesis. These compounds have potential applications in various fields. [Extracted from the article]