期刊
ORGANIC LETTERS
卷 23, 期 16, 页码 6530-6535出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.1c02331
关键词
-
资金
- Stanford University
- NIH [RR 04648]
The study presents a method for the synthesis of cyclobutenes from olefins through a complex reaction pathway, achieving high yields and enantioenrichment.
Cyclobutenes are highly useful synthetic intermediates as well as important motifs in bioactive small molecules. Herein, we report a regio-, chemo-, and enantioselective synthesis of cyclobutenes from olefins using N-sulfonyl-1,2,3-triazoles as vicinal dicarbene equivalents or alkyne [2 + 2] cycloaddition surrogates. Terminal and cis-olefins can be transformed into enantioenriched cyclopropanes via rhodium catalysis. Then, in one pot, treatment of these intermediates with tosyl hydrazide and base effects diazo formation followed by rhodium-catalyzed ring expansion to yield enantioenriched cyclobutenes. These cyclobutenes can be transformed into highly substituted, enantioenriched cyclobutanes, including structures relevant to natural product scaffolds.
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