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Preparation of 1° Amines: Azide Synthesis

Preparation of 1° Amines: Azide Synthesis

Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.

Chirality in Nature

Chirality in Nature

Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.

Preparation of 1° Amines: Gabriel Synthesis

Preparation of 1° Amines: Gabriel Synthesis

Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...

Structure of Amines

Structure of Amines

The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...

Prochirality

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...

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Related Experiment Video

Updated: Jun 22, 2025

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

Published on: February 16, 2018

Enzymatic Routes for Chiral Amine Synthesis: Protein Engineering and Process Optimization.

Sayali Shantaram Vikhrankar¹, Seema Satbhai², Priyanka Kulkarni²

¹Biosciences and Biomedical Engineering, Indian Institute of Technology Indore, Indore, MP, India.

Biologics : Targets & Therapy

|July 1, 2024

Summary

This summary is machine-generated.

Biocatalysis offers sustainable, efficient routes to chiral amines, crucial for pharmaceuticals and agrochemicals. Advances in enzyme engineering and process development enable scalable, economical enzymatic synthesis.

Keywords:

biocatalysis chiral amines co-factor regeneration enzyme immobilization protein engineering sitagliptin ω-transaminases

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Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine

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Last Updated: Jun 22, 2025

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

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Published on: February 16, 2018

Hydrolysis of a Ni-Schiff-Base Complex Using Conditions Suitable for Retention of Acid-labile Protecting Groups

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Published on: April 6, 2017

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine

Published on: June 13, 2022

Area of Science:

Biocatalysis and Enzyme Engineering
Organic Synthesis
Sustainable Chemistry

Background:

Chiral amines are vital building blocks in pharmaceuticals, agrochemicals, and specialty chemicals.
Traditional synthesis methods often suffer from poor stereoselectivity and harsh reaction conditions.
Biocatalytic approaches using enzymes present a sustainable and efficient alternative.

Purpose of the Study:

To review recent advancements in enzyme engineering for chiral amine synthesis.
To highlight strategies for improving enzyme catalytic performance and expanding substrate scope.
To discuss the integration of process development for viable biomanufacturing.

Main Methods:

Protein engineering techniques including directed evolution and computational redesign.
Enzyme immobilization for enhanced stability and reusability.
Techno-economic assessments for process optimization and scalability.

Main Results:

Engineered transaminases, oxidases, and other enzymes show improved catalytic efficiency and selectivity.
Expanded substrate scope achieved through advanced protein engineering strategies.
Successful integration of enzyme engineering with process development for biomanufacturing.

Conclusions:

State-of-the-art enzyme engineering significantly enhances biocatalytic synthesis of chiral amines.
Multifaceted process development is key to establishing scalable and economical biomanufacturing routes.
Enzymatic synthesis holds great promise for the sustainable production of diverse chiral amine targets.