An
efficient and atom-economical silver-mediated [2 + 2 + 1] cyclization
protocol for the synthesis of 3,4-fused-ring-substituted and 2,5-unsubstituted
selenophenes or thiophenes has been developed. Two C–Se/C–S
bonds and one C–C bond were rapidly constructed in one step.
Readily accessible substrates, commercially available elemental selenium/sulfur,
and good functional group tolerance make this procedure attractive
for the synthesis of π-conjugated material molecules.
A straightforward protocol for the synthesis of various 1,4-dithiines and 1,4-diselenin starting from alkynes and Elemental sulfur/selenium under transition-metal-free conditions has been demonstrated. This methodology efficiently constructs a broad range...
Copper-catalyzed synthesis of benzo[4,5]thiazolo[3,2-a]indoles from element sulfur and 1-(2-iodophenyl)-1H-indoles is reported. Two sp2 C-S bonds are generated during the process. This is the first example of making benzo[4,5]thiazolo[3,2-a]indoles from...
A novel base-promoted and highly efficient strategy for the preparation of medium-size-ring sulfonyl derivatives has been developed. This method is realized by alkynes insertion into C-C σ-bond of cyclic β-keto...
We
report a four-component ring-opening reaction of pyrroles via
C–N bond cleavage. In this process, elemental sulfur is used
as the sulfur source of thiazole and thioamide and the reductant of
olefin. A series of benzothiazoles functionalized with thiopropionamides
at the C2 position were synthesized using this method. A plausible
reaction mechanism is proposed based on the concise control experiments.
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