Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 6, Pages 2926-2929Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja211486f
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Funding
- Natural Science Foundation of China [20920102030]
- 973 program from National Basic Research Program of China [2011CB808601, 2012CB821600]
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A highly regioselective base-mediated ring expansion of 2,4-diiminoazetidines via cleavage of C-N and C(sp(3))-H bonds is achieved for the first time to afford efficiently 2,3-dihydropyrimidinesulfonamides. The mechanism of the ring expansion via tandem 4 pi electrocyclic ring-opening/1,5-H shift/6 pi electrocydic ring-closing is well confirmed by the trapping experiments of two key intermediates and deuterium labeling studies.
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