Rh(II)-catalyzed reactions of differentially substituted bis(diazo) functionalities
Sara A Bonderoff1, Albert Padwa
1Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA.
Donor/acceptor diazo groups in molecules undergo selective reactions like cyclopropanation, leaving acceptor/acceptor diazo groups for further reactions. This rhodium(II)-catalyzed process enables sequential chemical transformations.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Molecules with multiple diazo groups present synthetic challenges due to competing reaction pathways.
- Controlling chemoselectivity in reactions involving donor/acceptor (D/A) and acceptor/acceptor (A/A) diazo moieties is crucial for complex molecule synthesis.
Purpose of the Study:
- To investigate the chemoselective reactivity of D/A and A/A diazo groups within the same molecule.
- To explore the potential for sequential reactions using rhodium(II) catalysis.
Main Methods:
- Utilized 3-diazo-1-(ethyl 2-diazomalonyl)indolin-2-one as a substrate containing both D/A and A/A diazo functionalities.
- Employed rhodium(II) catalysis to initiate and control the diazo reactions.
Main Results:
- The D/A diazo group selectively underwent cyclopropanation and XH-insertion reactions.
- The A/A diazo group remained intact after the initial reaction, available for subsequent transformations.
- Demonstrated a stepwise reaction pathway controlled by the nature of the diazo groups.
Conclusions:
- Rhodium(II) catalysis enables chemoselective reactions of D/A diazo groups in the presence of A/A diazo groups.
- This selectivity allows for sequential functionalization, opening avenues for complex molecular architectures.
- The findings provide a valuable tool for synthetic organic chemists seeking to control reactivity in poly-diazo compounds.
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