Synthesis of Arylallenes by Palladium-Catalyzed Retro-Propargylation of Homopropargyl Alcohols
摘要:
Treatment of tertiary homopropargyl alcohol with aryl halide under palladium catalysis provided arylallenes regioselectively. The reaction includes retropropargylation, which proceeds in a concerted fashion via a cyclic transition state and transfers the stereochemistry of homopropargyl alcohols through C-C bond cleavage. The present method enables the use of homopropargyl alcohols as allenylmetal equivalents.
Synthesis of optically active allenes using tandem enzyme and palladium-catalysed reactions
作者:Pierre H. Dixneuf、Pierre H. Dixneuf、Thierry Guyot、Mark D. Ness、Stanley M. Roberts
DOI:10.1039/a704374k
日期:——
The propargylic carbonates (S)-6 and (R)-9 are converted into the chiral allenes 10, 11, 13 and 14 (ee 82–85%) using organozinc reagents and tetrakis(triphenylphosphine)- palladium as catalyst.