Functionalized macrocycles from functionalized tetra-amines: pendent-arm macrocycles derived from dichloropivalic...

Area of Science:

• Coordination Chemistry
• Organic Synthesis
• Macrocyclic Chemistry

Background:

• Ethane-1,2-diamine and 3,3'-dichloropivalic acid reactions yield isomeric tetra-amine derivatives.
• The synthesis of macrocycles from these derivatives is explored.
• Azetidinone intermediates are proposed in related dichloropivalate chemistry.

Purpose of the Study:

• To investigate the synthesis of novel tetra-amine derivatives and their subsequent conversion into macrocyclic structures.
• To explore the formation of pendent-arm macrocycles with distinct functional groups.
• To understand the reaction mechanisms involving diamines and dichloropivalic acid derivatives.

Main Methods:

• Reaction of ethane-1,2-diamine with 3,3'-dichloropivalic acid under varying conditions.
• Complexation of tetra-amine derivatives with Cu(II).
• Conversion of Cu(II) complexes to cyclam-like macrocycles using nitroethane and formaldehyde.

Main Results:

• Two isomeric tetra-amine derivatives were isolated: a tetraamino carboxylic acid and a carboxamidotriamino alcohol.
• The intended macrocycle synthesis yielded derivatives of both tetra-amine isomers.
• A single reaction pathway produced pendent-arm macrocycles with both electrophilic and nucleophilic substituents.
• Propane-1,3-diamine showed different reactivity under similar conditions.

Conclusions:

• The reaction of ethane-1,2-diamine with 3,3'-dichloropivalic acid offers a versatile route to diverse tetra-amine structures.
• Azetidinone intermediates likely play a role in the formation of macrocyclic products.
• This methodology provides a single-step synthesis of functionalized macrocycles with potential for diverse applications.
• The observed differences in reactivity highlight the importance of diamine structure in dichloropivalate chemistry.