Tetrahedron p. 10871 - 10886 (1999)
Update date:2022-08-23
Topics:
Boiadjiev, Stefan E.
Lightner, David A.
Dipyrrinones formed by DBU and n-Bu3P-promoted condensation of 5-p- toluenesulfonylpyrrolinones with pyrrole 2-aldehydes, gave high yields of product with predominantly the E-configuration when the aldehyde had a 5- carboethoxy group. The 4E-dipyrrinones were readily purified by chromatography and were stable in solutions shielded from light.
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