2-Indolinospirone Compound Synthesis via Stereoselective Cycloaddition
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Solution Overview
Problem
Existing methods for preparing 2-indolinospirone compounds lack simplicity and stereoselectivity, which are crucial for effective treatment of hyperproliferative diseases.
Innovation Solution
A novel method involving a 1,3-dipolar cycloaddition reaction of specific compounds in the presence of a metal source, phosphine ligand, and base, followed by Borch and hydrolysis reactions, to synthesize 2-indolinospirone compounds with high stereoselectivity and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing methods for preparing 2-indolinospirone compounds are used, then the synthesis can be completed, but the process lacks simplicity and stereoselectivity
Solution Approach 1:
The synthesis process is divided into three distinct reaction steps: (1) 1,3-dipolar cycloaddition reaction to form the core structure, (2) Borch reaction to introduce the spirone ring system, and (3) hydrolysis reaction to finalize the compound. Each step is optimized independently to achieve high stereoselectivity while maintaining overall process simplicity.
Solution Approach 2:
The patent optimizes multiple reaction parameters including metal source (Cu(I) source), phosphine ligand type, base amount (0.01:1 to 2.5:1 molar ratio), solvent volume/mass ratio (10:1 to 50:1 mL/g), and reaction temperature (20°C to reflux temperature) to achieve high stereoselectivity and yield in the 1,3-dipolar cycloaddition reaction.
2Productivity
If existing preparation methods are used, then compounds can be synthesized, but the yield and efficiency are insufficient
Solution Approach 1:
The synthesis process maintains continuous useful action through optimized reaction conditions where reactants are introduced in specific molar ratios (compound of formula 2 to compound of formula 1: 1:1 to 5:1, cyclohexanone to compound of formula 1: 1:1 to 10:1) and the reactions proceed through controlled temperature ranges to maximize yield at each step without significant material loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method provides a simple and efficient synthesis of 2-indolinospirone compounds with high stereoselectivity and yield, suitable for treating hyperproliferative diseases.
Implementation Method 1
carrying out a 1,3-dipolar cycloaddition reaction of compound of formula 1, compound of formula 2 and cyclohexanone in an organic solvent in the presence of a metal source, a phosphine ligand and a base
Implementation Method 2
carrying out a Borch reaction of the compound of formula 3 prepared by step (i) and acetaldehyde in a solvent in the presence of an acid and a reducing agent
Implementation Method 3
carrying out a hydrolysis reaction of the compound of formula 4 prepared by step (a) in a solvent in the presence of a base
Data Source
AI summary
Disclosed is a method for preparing 2-indolinospirone compound and intermediate thereof, specifically disclosed is a method for preparing a compound of formula 5. The method is relatively simple and has high stereoselectivity and yield.