1359875-77-6Relevant articles and documents
Regioselective ring expansion of 2,4-diiminoazetidines via cleavage of C-N and C(sp3)-H bonds: Efficient construction of 2,3- dihydropyrimidinesulfonamides
Wang, Yang,Chi, Yue,Zhang, Wen-Xiong,Xi, Zhenfeng
supporting information; experimental part, p. 2926 - 2929 (2012/03/27)
A highly regioselective base-mediated ring expansion of 2,4-diiminoazetidines via cleavage of C-N and C(sp3)-H bonds is achieved for the first time to afford efficiently 2,3- dihydropyrimidinesulfonamides. The mechanism of the ring expansion via tandem 4π electrocyclic ring-opening/1,5-H shift/6π electrocyclic ring-closing is well confirmed by the trapping experiments of two key intermediates and deuterium labeling studies.