AD-35 Synthesis via Cyclopropane Lactamization
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Solution Overview
Problem
The existing synthesis route for preparing AD-35, a potential drug for Alzheimer's disease, is lengthy, complicated, and has low yield, making it unsuitable for industrial production.
Innovation Solution
A new method involving specific reaction steps including cyclopropane lactamization with titanium (IV) isopropoxide and a Grignard reagent, followed by coupling with a base, and subsequent salification with phosphoric acid to produce AD-35 with improved yield and simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing synthesis route for preparing AD-35 is used, then the compound can be produced, but the synthesis route is too long, the operation is complicated, and the yield is low
Solution Approach 1:
The patent divides the synthesis route into distinct modular stages: (i) preparation of cyano ester intermediate, (ii) cyclopropane lactamization to form spirocyclopropane lactam, (iii) coupling reactions to build the final structure, and (iv) salification with phosphoric acid. This segmentation allows each stage to be optimized independently, improving overall yield and simplifying operational complexity.
Solution Approach 2:
The patent performs preliminary actions by pre-synthesizing and characterizing key intermediates (cyano ester and spirocyclopropane lactam) with defined structures and properties before final assembly. This preliminary characterization ensures high purity inputs for subsequent steps, preventing yield loss and simplifying troubleshooting.
2Ease of manufacture
If the existing synthesis route is used, then AD-35 can be produced, but some steps are not applicable to industrial production
Solution Approach 1:
The patent optimizes reaction parameters for industrial scalability including solvent selection (ethyl acetate, dichloromethane, tetrahydrofuran), temperature control (0-25°C for cyclopropane lactamization), and stoichiometric ratios (1:1.1 to 1:1.5 for key reactions). These parameter changes ensure consistent quality and yield at scale while maintaining safety and environmental compliance.
Solution Approach 2:
The patent employs readily available, inexpensive reagents and solvents that can be easily handled and disposed of, such as ethylmagnesium bromide, phosphoric acid, and common organic solvents. This approach reduces manufacturing costs and simplifies waste management in industrial settings.
3Ease of operation
If the existing synthesis route is used, then the operation is complicated, but the compound can be produced
Solution Approach 1:
The patent introduces well-defined intermediate compounds (cyano ester with formula IV and spirocyclopropane lactam with formula V) that serve as stable, isolable intermediates between synthesis stages. These intermediates can be purified by standard techniques and stored, simplifying operational procedures and improving overall synthesis efficiency.
Solution Approach 2:
The patent designs a continuous synthesis flow where each reaction stage feeds directly into the next without interruption. The cyclopropane lactamization product is directly coupled with the piperidine derivative, and the final salification step completes the sequence, maintaining continuous productive action throughout the synthesis.
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 new method simplifies the synthesis, reduces costs, eliminates toxic reagents, and is suitable for industrial production, providing a high-yield, environmentally friendly process for producing AD-35.
Implementation Method 1
performing a cyclopropane lactamization of a cyano ester shown by Formula IV under the action of titanium (IV) isopropoxide (Ti(Oi-Pr)4) and a Grignard reagent of ethylmagnesium halide
Implementation Method 2
The compound shown by Formula XI and phosphoric acid are subjected to salification to obtain the compound of Formula (I)
Data Source
AI summary
Disclosed are a method for preparing a benzodioxole derivative (AD-35) shown by Formula (I) and an intermediate thereof. The method of the present invention involves: using piperic acid as a raw material; and performing bromination, esterification, cyanidation, cyclopropane lactamization, amide nitrogen alkylation, deprotection, piperidine nitrogen alkylation and salification to obtain the compound of Formula (I). The method has cheap and easily available start raw materials, short synthesis routes and simple operation, and is suitable for industrial production. ##STR00001##