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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Photocatalytic Access to Cyclopropanes Via Triplet Carbene Transfer from Acceptor-Acceptor Diazoalkanes
Mengyu Gao1,2, Chuanyang Song1, Xintao Liu1
1College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, P. R. China.
Abstract:
A visible-light photocatalytic cyclopropanation of diverse alkenes using acceptor-acceptor diazoalkanes has been developed. The protocol provides an efficient and practical approach to donor-acceptor cyclopropanes under mild conditions. Experimental evidence confirms a mechanism involving a highly electrophilic triplet acceptor-acceptor carbene intermediate, followed by ultrafast intersystem crossing and ring closure.
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