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Updated: Apr 25, 2026

Solid-phase Synthesis of [4.4] Spirocyclic Oximes

Solid-phase Synthesis of [4.4] Spirocyclic Oximes

Published on: February 6, 2019

An oxidation-labile traceless linker for solid-phase synthesis.

F Stieber¹, U Grether, H Waldmann

¹Institut für Organische Chemie der Universität, Richard-Willstätter-Allee 2, D-76128 Karlsruhe, Germany, Fax: (+49) 721-608-4825.

Angewandte Chemie (International Ed. in English)

|August 21, 2014

Summary

This summary is machine-generated.

A novel hydrazide linker enables traceless solid-phase synthesis. This method allows mild release of diverse molecules, including biaryls and amines, for combinatorial chemistry applications.

Keywords:

Antibiotics Combinatorial chemistry Hydrazides Oxidations Solid-phase synthesis

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Area of Science:

Organic Chemistry
Synthetic Chemistry
Medicinal Chemistry

Background:

Solid-phase synthesis is crucial for drug discovery and materials science.
Existing linkers can have limitations in cleavage conditions or scope.
Developing new linkers is essential for expanding synthetic capabilities.

Purpose of the Study:

To introduce a new hydrazide-based linker for solid-phase synthesis.
To demonstrate the traceless and mild cleavage of various functional groups.
To highlight the utility of this linker in combinatorial chemistry.

Main Methods:

Oxidation of a hydrazide group to an acyl diazene intermediate.
Nucleophilic cleavage of the acyl diazene to release the desired molecule.
Application of the linker to various solid supports and functional groups.

Main Results:

Successful traceless release of biaryls, acetylenes, alkenes, heterocycles, thioethers, and secondary amines.
Cleavage achieved under very mild conditions, preserving molecular integrity.
Demonstrated versatility across different chemical classes and solid supports.

Conclusions:

The hydrazide linker offers a mild and efficient method for solid-phase synthesis.
Its traceless nature simplifies purification and is advantageous for combinatorial libraries.
This linker represents a valuable tool for modern organic and medicinal chemistry.