TIETZE, LUTZ E.;WUNSCH, JOSEF R., SYNTHESIS,(1990) N1, C. 985-990
作者:TIETZE, LUTZ E.、WUNSCH, JOSEF R.
DOI:——
日期:——
Intramolecular Ene and Related Reactions, Part 9. Photochemically Induced Synthesis of Allylsilane Carbaldehydes
作者:Lutz F. Tietze、Josef R. Wünsch
DOI:10.1055/s-1990-27070
日期:——
Allylsilane carbaldehydes are valuable substrates for the tandem Knoevenagel allylsilane and iminium cyclization. They can easily be prepared by a photochemical α-cleavage of cyclic ketones bearing a trimethylsilylmethyl group in the α-position (Norrish Type I cleavage). The photolytic process is facilitated by the silicon due to its stabilization of a radical in the β-position. Irradiation of the ketones 15a-d leads mainly to the aldehydes 16a-d. In addition irradiation of 19a gives mostly the aldehyde 20.