This sulfone allowed the preparation of Z-fluoroalkenoates with very high stereoselectivity from both aromatic and aliphatic aldehydes. The nature of the heterocycle on the course of the Julia–Kocienskireaction is discussed.
DIAD-mediated metal-free cross dehydrogenative coupling between tertiary amines and α-fluorinated sulfones
作者:Weizhou Huang、Chuanfa Ni、Yanchuan Zhao、Jinbo Hu
DOI:10.1039/c2nj40842b
日期:——
A DIAD-mediated metal-free cross dehydrogenative coupling involving aliphatic tertiary amines and α-fluorinated sulfones leading to β-fluorinated amines was developed. This protocol represents the first direct fluoroalkylation of CâH bonds with hydrofluorocarbon derivatives (RFâH).
Copper-Catalyzed Debenzoylative Monofluoromethylation of Aryl Iodides Assisted by the Removable (2-Pyridyl)sulfonyl Group
作者:Yanchuan Zhao、Chuanfa Ni、Fanzhou Jiang、Bing Gao、Xiao Shen、Jinbo Hu
DOI:10.1021/cs4000574
日期:2013.4.5
A new method for aromatic monofluoromethylation was developed. Aryl iodides can be efficiently transformed into the corresponding monofluoromethylated products by a copper-catalyzed debenzoylative fluoroalkylation with 2-PySO2CHFCOR and subsequent reductive desulfonylation. The (2-pyridyl)sulfonyl moiety plays an important role in the copper-catalyzed cross-coupling, and it can be removed easily through Bu3SnH-mediated desulfonylation.