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Dimethylthiocarbamate (DMTC): an alcohol protecting group
D K Barma1, A Bandyopadhyay, Jorge H Capdevila
1Departments of Biochemistry and Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9038, USA.
Organic Letters
|December 5, 2003
Summary
Dimethylthiocarbamates (DMTCs) are stable alcohol protecting groups. They are easily removed with periodate or hydrogen peroxide, offering a selective deprotection strategy.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- Alcohol protecting groups are essential in multi-step organic synthesis.
- Developing robust and selectively removable protecting groups is a key challenge.
Purpose of the Study:
- To introduce and characterize dimethylthiocarbamates (DMTCs) as novel alcohol protecting groups.
- To evaluate the stability and cleavage conditions for DMTCs.
Main Methods:
- DMTCs were synthesized from corresponding alcohols and dimethylthiocarbamoyl chloride.
- Stability of DMTCs was tested against a wide array of common synthetic reagents and conditions.
- Selective removal of DMTCs was investigated in the presence of other protecting groups.
Main Results:
- DMTCs are spectrally simple, achiral, and nonpolar compounds.
- DMTCs exhibit moderate to high stability towards various reagents (e.g., hydrides, organometallics, acids, bases, oxidants, reductants) and conditions (e.g., heat, Lewis acids).
- DMTCs are readily cleaved by sodium periodate (NaIO4) or hydrogen peroxide (H2O2).
Conclusions:
- Dimethylthiocarbamates serve as versatile and stable protecting groups for alcohols.
- Their selective removal conditions allow for orthogonal deprotection strategies in complex syntheses.