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.
TIETZE, LUTZ E.;WUNSCH, JOSEF R., SYNTHESIS,(1990) N1, C. 985-990
作者:TIETZE, LUTZ E.、WUNSCH, JOSEF R.
DOI:——
日期:——
LIPSHUTZ B. H.; PARKER D. A.; NGUYEN S. L.; MCCARTHY K. E.; BARTON J. C.;+, TETRAHEDRON, 42,(1986) N 11, 2873-2879
作者:LIPSHUTZ B. H.、 PARKER D. A.、 NGUYEN S. L.、 MCCARTHY K. E.、 BARTON J. C.、+
DOI:——
日期:——
Reactions of stoichiometric higher order, mixed lithio magnesio organocuprates
作者:Bruce H. Lipshutz、David A. Parker、Sam L. Nguyen、Keith E. McCarthy、John C. Barton、Scott E. Whitney、Hiyoshizo Kotsuki
DOI:10.1016/s0040-4020(01)90576-9
日期:1986.1
2-lithiothiophene and RMgX. Reactions of various members of this new class of reagents are described, including substitution and conjugateaddition processes, where the ligand derived from the Grignard reagent is selectively transferred. The effects of added BF3.Et2O are discussed. Some comparison reactions with the corresponding lower order reagents, RCu(CN)MgBr, have also been carried out. Evidence is presented