期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 25, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202202364
关键词
1; 3-Enynes; Allene; C-H Activation; Cobalt; Multicomponent Reactions
资金
- NIH [R35GM122473]
- NSERC of Canada
An efficient and stereoselective Co-III-catalyzed sequential C-H bond addition method to 1,3-enynes and aldehydes is reported, providing a new way to prepare allenyl alcohol products. The mechanism of this transformation is proposed and supported by the X-ray structural characterization of a cobaltacycle intermediate.
An efficient and stereoselective Co-III-catalyzed sequential C-H bond addition to 1,3-enynes and aldehydes is disclosed. This transformation represents the first example of sequential C-H bond additions to 1,3-enynes and a second coupling partner and provides the first example of preparing allenes by C-H bond addition to 1,3-enynes. A wide range of aldehydes, C-H bond substrates and 1,3-enynes with large substituents on the alkynes are effective substrates. The allenyl alcohol products can be further converted to dihydrofurans with high stereoselectivity either in situ or under Ag-mediated cyclization conditions. The allenyl silyl group can also be transferred to the adjacent alcohol by a Brook rearrangement. Moreover, a mechanism for the transformation is proposed supported by X-ray structural characterization of a cobaltacycle intermediate.
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