摘要:
N-Tosyl-beta-aminovinyl-phenyl-ketones 1a - i are prepared in good yields from beta-chlorovinyl-phenyl-ketones by reaction with the sodium salts of tosyl amides in dry DMF at room temperature. In contrast to the relatively photostable N,N-dialkyl-beta-aminovinyl-aryl-ketones the electronically excited 1 give irreversible chemical reactions within a few minutes. Among other not identified photoproducts the alpha-tosyl-beta-aminovinyl-phenyl-ketones 2 were found. From the experimental results it is evident that the migration of the tosyl group prefers a radical-type two step reaction through an intermediate X/Y of a (1,5)-N --> O-tosylrearrangement.