Copper-catalyzed cross -coupling reactions: The formation of carbon-carbon and carbon -sulfur bonds
We have developed copper-catalyzed cross-coupling reactions for the formation of carbon-carbon and carbon-sulfur bonds. These newly developed methods demonstrate that the conditions of the traditional Ullmann reaction can be improved. We describe the synthesis of diarylacetylenes through the cross-c...
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ndltd-UMASS-oai-scholarworks.umass.edu-dissertations-40542020-12-02T14:36:17Z Copper-catalyzed cross -coupling reactions: The formation of carbon-carbon and carbon -sulfur bonds Bates, Craig G We have developed copper-catalyzed cross-coupling reactions for the formation of carbon-carbon and carbon-sulfur bonds. These newly developed methods demonstrate that the conditions of the traditional Ullmann reaction can be improved. We describe the synthesis of diarylacetylenes through the cross-coupling of aryl iodides and phenylacetylene using [Cu(phen)PPh 3Br] as the catalyst. This method is then utilized for the synthesis of 2-aryl-benzo[b]furans via a copper-catalyzed cross-coupling reaction between aryl acetylenes and 2-iodophenols and a subsequent 5-endo-dig cyclization. The formation of carbon-acetylene bonds is also extended to include vinyl iodides for the purpose of synthesizing 1,3-enynes. Due the lack of a general metal-mediated synthesis of aryl sulfides, we developed a copper-catalyzed cross-coupling reaction between aryl iodides and thiols using a catalytic amount of CuI and 2,9-dimethyl-1,10-phenanthroline as an additive. This method was also extended to include vinyl iodides for the synthesis of vinyl sulfides using [Cu(phen)(PPh3)2]NO3 as the catalyst. All of these methods afford the desired product in good to excellent yields without the use of palladium or expensive/air sensitive additives. 2005-01-01T08:00:00Z text https://scholarworks.umass.edu/dissertations/AAI3179856 Doctoral Dissertations Available from Proquest ENG ScholarWorks@UMass Amherst Organic chemistry |
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ENG |
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Organic chemistry |
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Organic chemistry Bates, Craig G Copper-catalyzed cross -coupling reactions: The formation of carbon-carbon and carbon -sulfur bonds |
description |
We have developed copper-catalyzed cross-coupling reactions for the formation of carbon-carbon and carbon-sulfur bonds. These newly developed methods demonstrate that the conditions of the traditional Ullmann reaction can be improved. We describe the synthesis of diarylacetylenes through the cross-coupling of aryl iodides and phenylacetylene using [Cu(phen)PPh 3Br] as the catalyst. This method is then utilized for the synthesis of 2-aryl-benzo[b]furans via a copper-catalyzed cross-coupling reaction between aryl acetylenes and 2-iodophenols and a subsequent 5-endo-dig cyclization. The formation of carbon-acetylene bonds is also extended to include vinyl iodides for the purpose of synthesizing 1,3-enynes. Due the lack of a general metal-mediated synthesis of aryl sulfides, we developed a copper-catalyzed cross-coupling reaction between aryl iodides and thiols using a catalytic amount of CuI and 2,9-dimethyl-1,10-phenanthroline as an additive. This method was also extended to include vinyl iodides for the synthesis of vinyl sulfides using [Cu(phen)(PPh3)2]NO3 as the catalyst. All of these methods afford the desired product in good to excellent yields without the use of palladium or expensive/air sensitive additives. |
author |
Bates, Craig G |
author_facet |
Bates, Craig G |
author_sort |
Bates, Craig G |
title |
Copper-catalyzed cross -coupling reactions: The formation of carbon-carbon and carbon -sulfur bonds |
title_short |
Copper-catalyzed cross -coupling reactions: The formation of carbon-carbon and carbon -sulfur bonds |
title_full |
Copper-catalyzed cross -coupling reactions: The formation of carbon-carbon and carbon -sulfur bonds |
title_fullStr |
Copper-catalyzed cross -coupling reactions: The formation of carbon-carbon and carbon -sulfur bonds |
title_full_unstemmed |
Copper-catalyzed cross -coupling reactions: The formation of carbon-carbon and carbon -sulfur bonds |
title_sort |
copper-catalyzed cross -coupling reactions: the formation of carbon-carbon and carbon -sulfur bonds |
publisher |
ScholarWorks@UMass Amherst |
publishDate |
2005 |
url |
https://scholarworks.umass.edu/dissertations/AAI3179856 |
work_keys_str_mv |
AT batescraigg coppercatalyzedcrosscouplingreactionstheformationofcarboncarbonandcarbonsulfurbonds |
_version_ |
1719365293782859776 |