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DOI: 10.1055/s-2002-35576
Iridium Complex-Catalyzed Highly Selective Organic Synthesis
Publikationsverlauf
Publikationsdatum:
20. November 2002 (online)
Abstract
Two different synthetic reactions catalyzed by an iridium complex are discussed. The first is allylic alkylation and allylic amination. This reaction proceeds via a π-allyl iridium intermediate. The selectivity strongly depends on the structure of the allylic esters. Highly branched product-selective allylic substitution and highly Z-selective allylic substitution were achieved. The selectivities of allylic substitution described here have not been achieved in previous studies with other transition metal complexes. The second reaction is [2+2+2] cycloaddition of α,ω-diynes with monoynes. This reaction proceeds via iridacyclopentadiene and tolerates various functional groups. Functionalized monoynes can be used. These results show that an iridium complex can be a useful catalyst for carbon-carbon and carbon-heteroatom bond formation.
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1 Introduction
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2 Allylic Alkylation
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2.1 Branched Product-Selective Allylic Alkylation
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2.2 Z-Selective Allylic Alkylation
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3 Allylic Amination
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3.1 Branched Amine-Selective Allylic Amination
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3.2 Z-Selective Allylic Amination
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4 [2+2+2] Cycloaddition of α,ω-Diynes with Monoynes
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5 Conclusion
Key words
iridium complex - catalysis - π-allyl iridium - iridacyclopentadiene - allylic esters - alkynes
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