1,3-Dipolar cycloaddition reaction of diazomethane and ethyl diazoacetate with tributylstannylacetylenes occurred regioselectively to afford the corresponding 3(5)-tributylstannylpyrazoles. The cycloaddition reaction of 3-phenylsydnone with the stannylacetylenes proceeded also regioselectively, and 3-tributylstannyl-1-phenylpyrazoles were isolated. 4-Tributylannyl- and 5-tributylstannyl-1-phenylstpyrazole were prepared by the stannylation of 4-lithio- and 5-lithio-1-phenylpyrazoles with tributylstannyl chloride. Iodinatton, benzoylation, and phenylation of the stannylpyrazoles were examined.
|Number of pages||6|
|Publication status||Published - 1992 Apr 1|
ASJC Scopus subject areas
- Organic Chemistry