Silver(I)-Catalyzed Aminocyclization of 2,3-Butadienyl and 3,4-Pentadienyl Carbamates: An Efficient and Stereoselective Synthesis of 4-Vinyl-2-oxazolidinones and 4-Vinyltetrahydro-2H-1,3-oxazin-2-ones
Silver(I)-Catalyzed Aminocyclization of 2,3-Butadienyl and 3,4-Pentadienyl Carbamates: An Efficient and Stereoselective Synthesis of 4-Vinyl-2-oxazolidinones and 4-Vinyltetrahydro-2H-1,3-oxazin-2-ones
Palladium(II)-Catalyzed S<sub>N</sub>2‘ Reactions of α-Allenic Acetates. Stereoconvergent Synthesis of (<i>Z</i>,<i>E</i>)-2-Bromo-1,3-dienes
作者:Attila Horváth、Jan-E. Bäckvall
DOI:10.1021/jo015950x
日期:2001.11.1
The reaction of acetylated a-allenic alcohols with LiBr in the presence of 1.5 mol % of Pd(OAc)(2) provides easy access to substituted (Z,E)-2-bromo-1,3-dienes in good yields with excellent diastereoselectivity. Both secondary and tertiary acetates as well as terminal and nonterminal allenes were studied to investigate the scope and the limitations of the reaction. A mechanism is proposed to clarify how a diastereomeric mixture of the starting compound is transformed into a single diastereomer of the product.
Synthese stereoselective de dienes conjugues a partir d'alcools α-alleniques
作者:Dariouche Djahanbini、Bernard Cazes、Jacques Gore
DOI:10.1016/s0040-4020(01)88795-0
日期:1984.1
DOUTHEAU A.; GORE J.; MALACRIA M., TETRAHEDRON, 1977, 33,