Easy access to substituted selenazine and selenopyran derivatives by a cycloaddition-cyclorersion process

Article abstract of DOI:10.1016/0040-4039(94)02229-5

N′-selenoacylamidines were isolated by condensation of selenobenzamide with orthoamides. [4+2] cycloadditions with electrophilic dienophiles were performed leading to 1,3- selenazine derivatives. Selenoamide vinylogs obtained by thermolysis of 4H-1,3-sele