Bipyridine Derivative Synthesis via Metal Complex Crystallization
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Solution Overview
Problem
The existing methods for producing bipyridine derivatives face challenges with low crystallinity of intermediates, making purification by crystallization difficult, and require costly column chromatography, which is not industrially viable for mass production, and also result in low yields of the ligand.
Innovation Solution
A method involving the formation of a metal complex using a metal salt with a multidentate ligand, followed by halogenation, pyrrole group introduction, and demetalation steps to produce a bipyridine derivative with improved crystallinity, allowing for high-purity production without column chromatography and increasing yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If purification by column chromatography is used to obtain high-purity compounds, then product purity is improved, but production cost increases and process complexity increases making it unsuitable for mass production
Solution Approach 1:
The patent introduces a protecting group on the nitrogen atom of the bipyridine derivative before performing bromination and other reactions. This preliminary protective action prevents unwanted side reactions and ensures that the intermediate compounds have sufficient crystallinity for purification by crystallization rather than requiring column chromatography, thus simplifying the overall process while maintaining high purity
Solution Approach 2:
The patent changes the chemical parameters by introducing specific protecting groups (such as Boc, Fmoc, orCbz groups) that modify the physical properties of the intermediate compounds. These parameter changes result in improved crystallinity and solubility characteristics, enabling purification by crystallization and eliminating the need for column chromatography
2Productivity
If existing synthesis routes are used for bipyridine derivatives, then product can be obtained, but yield is low and multiple purification steps are required
Solution Approach 1:
The protecting group is introduced at the beginning of the synthesis route to prevent side reactions during subsequent bromination and coupling reactions. This preliminary protective measure increases reaction efficiency and yield while ensuring that intermediates crystallize properly, reducing the number of purification steps required
Solution Approach 2:
The protecting group acts as an intermediary that temporarily modifies the nitrogen atom's reactivity. This intermediary structure allows the synthesis to proceed through high-yield reactions and enables purification by crystallization, after which the protecting group is removed to give the final product
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
This method enables the production of high-purity bipyridine derivatives with enhanced crystallinity, eliminating the need for column chromatography and achieving higher yields, making the process industrially advantageous.
Implementation Method 1
a first step of obtaining a metal complex 1 represented by the following formula (2) from a compound represented by the following formula (1)
Implementation Method 2
the second step includes one or both step of a halogenation reaction and a pyrrole group introducing reaction on the metal complex 1
Implementation Method 3
a demetalation step of the metal complex 2
Data Source
AI summary
A method for producing a bipyridine derivative represented by the following formula (3) includes a step of obtaining a metal complex as an intermediate. In the formula (3), R13 to R20 each represent a hydrogen atom or a substituent, the plurality of R13 to R20 may be the same or different, at least one of six Rs consisting of two R14s, two R15s, and two R16s represents a substituent, at least one of two R17s represents a hydrogen atom, any two substituents of R13 to R20 may be bonded to each other to form a ring, each of R17 to R20 may contain a halogen atom or a pyrrolyl group optionally having a substituent, and at least one of R14 to R16 contains a halogen atom or a pyrrolyl group optionally having a substituent.