A simple
and efficient mechanochemical-induced approach for the
synthesis of 1,2-diketoindolizine derivatives has been developed.
BaTiO3 was used as the piezoelectric material in this transformation.
This method features no usage of solvent, simple experimental operation,
scalable potential, and high conversion efficiency, which make it
attractive and practical.
Under mechanochemically induced conditions, a wide range of diarylphosphine oxides or H-phosphonates react with trisulfide dioxides to afford various thiophosphate derivatives in good yields. Selective S−S bond cleavage of trisulfide dioxides determined by connecting groups is proposed as the key step in the construction of P(O)−S or P(O)−S−S bonds, which is supported by calculations.
A wide
range of indolizines with allenes proceeded smoothly under
mechanochemically induced conditions via a [3+2] annulation process,
affording various substituted pyrrolo[2,1,5-cd]indolizines
in good yields. The reaction efficiency was greatly improved by using
piezoelectric material as the charge transfer catalyst. The photophysical
properties of the resulting pyrrolo[2,1,5-cd]indolizine
were characterized.
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