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Synlett 1999; 1999(12): 2004-2006
DOI: 10.1055/s-1999-2960
DOI: 10.1055/s-1999-2960
letter
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Tricarbonyl(dihydroazepinyl)chromium Complexes and Methylenepyrrolidines from (2′-Dimethylaminoethenyl)carbenechromium Complexes
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Publication History
Publication Date:
31 December 1999 (online)
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The (3-amino-1-ethoxyalkenylidene)pentacarbonylchromium complexes 1 and 8 react with bulkily substituted terminal alkynes 2 and 9 in tetrahydrofuran to give η5-tricarbonyl(dihydroazepinyl)chromium complexes 3 and 12a which can be isolated in low yields. When the reactions are carried out in pyridine, the formal [5 + 2] cycloaddition is favored, but the complexes of type 12 are immediately further transformed to 2-(isobutyrylmethylene)pyrrolidines 13 in good yields.
alkynes - carbene complexes - tricarbonyl(dihydroazepinyl)chromium complexes - methylenepyrrolidines