A Ru(II)-catalyzed approach for the rapid assembly of 1,2-benzothiazines has been developed to enable the coupling-cyclization of aryl Csp 2 ÀH bonds with a-carbonyl sulfoxonium ylides via Csp 2 ÀH activation process. The present method could be further applied to the construction of the 4-substituted 1,2benzothiazine skeletons.
Visible-light-induced
cross-coupling of arylsulfonyl azides with
tertiaryamines in the presence of Eosin Y at room temperature has
been achieved. This transformation features alkyl C–C bond
cleavage and provides a green approach to N-sulfonylamidines
under mild conditions.
A Co(II)-catalyzed pyridyl C−H bond carbenoid insertion with α-diazoacetates has been realized. This transformation features a highly regioselective C−C bond formation at the C3-position of pyridines, providing an efficient access to diverse α-aryl-α-pyridylacetates.
A Brønsted acid/visible-light-promoted Markovnikov hydroamination of arylalkenes with arylamines in the presence of TPT and CF3CO2H has been developed.
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