Title: Concave 1,10-Phenanthrolines by Ring-Closing Metathesis
Abstract:Ring-closing metathesis using Grubbs’ catalyst has been applied to the synthesis of the concave 1,10-phenanthrolines 5. Instead of a kinetically controlled double macrocyclization of the tetraphenol p...Ring-closing metathesis using Grubbs’ catalyst has been applied to the synthesis of the concave 1,10-phenanthrolines 5. Instead of a kinetically controlled double macrocyclization of the tetraphenol precursor 2 by two equivalents of ditosylates or diiodides, the new three step synthesis separates the alkylation of 2 from the macrocyclization. After the tetraalkylation of 2, the resulting tetraalkene 3 is cyclized by metathesis under thermodynamic control to give the bimacrocycles 4 in up to 92% yield. Hydrogenation of the alkene double bonds gave the bimacrocycles 5 in considerably improved overall yields (for instance for 5b from 19 to 79%).Read More
Publication Year: 2001
Publication Date: 2001-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 15
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