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Nomenclature of Primary Amines

Nomenclature of Primary Amines

Primary, secondary, and tertiary amines are compounds consisting of one, two, and three alkyl groups connected to the amino group (–NH2), respectively. As depicted in Figure 1, the common name of the primary amines is obtained by adding the suffix -amine to the alkyl substituent attached to the amino group as the corresponding alkylamine.

Structure of Conjugated Dienes

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

Nomenclature of Alkynes

Nomenclature of Alkynes

Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:

Cycloalkanes

Cycloalkanes

Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding acyclic alkane; therefore, their general formula is CnH2n. The structural formulas of cycloalkanes are simplified using the line-angle representation. The regular polygons are used to represent the cycloalkane rings, with each side representing a carbon-carbon bond.
The IUPAC nomenclature of cycloalkanes follows similar rules that apply to...

Nomenclature of Aryl and Heterocyclic Amines

Nomenclature of Aryl and Heterocyclic Amines

The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.

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Cyclobutane-derived diamines: synthesis and molecular structure.

Dmytro S Radchenko¹, Sergiy O Pavlenko, Oleksandr O Grygorenko

¹Department of Chemistry, Kyiv National Taras Shevchenko University, Volodymyrska Street 64, Kyiv 01033, Ukraine.

The Journal of Organic Chemistry

|August 11, 2010

Summary

Novel synthetic routes enable multigram preparation of Boc-monoprotected cyclobutane diamines. These sterically constrained building blocks are valuable for drug discovery and feature unique conformational properties.

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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Published on: February 7, 2019

Area of Science:

Organic Chemistry
Medicinal Chemistry
Drug Discovery

Background:

Sterically constrained diamines are crucial building blocks in drug discovery.
Cyclobutane diamines offer unique structural properties for pharmaceutical development.
Existing synthetic methods may limit the availability of these valuable compounds.

Purpose of the Study:

To develop efficient synthetic strategies for Boc-monoprotected cyclobutane diamines.
To enable the preparation of multigram quantities of these key intermediates.
To investigate the conformational preferences of novel cyclobutane diamine derivatives.

Main Methods:

Malonate alkylation chemistry for cyclobutane ring construction.
Boc-protection strategies for selective functionalization.
X-ray diffraction analysis for conformational studies.

Main Results:

Successful synthesis of Boc-monoprotected cis- and trans-1,3-diaminocyclobutane, 6-amino-3-azaspiro[3.3]heptane, and 3,6-diaminospiro[3.3]heptane.
Demonstrated scalability for multigram production.
Detailed conformational analysis of the synthesized cyclobutane diamine derivatives.

Conclusions:

The developed synthetic approach provides access to significant quantities of valuable cyclobutane diamine building blocks.
These compounds possess distinct conformational characteristics relevant to drug design.
The findings facilitate the incorporation of these sterically constrained diamines into novel therapeutic agents.