<i>ortho</i> and remote metalation – cross coupling strategies. Total synthesis of the naturally occurring fluorenone dengibsinin and the azafluoranthene alkaloid imeluteine
作者:J. -m. Fu、B. -p. Zhao、M. J. Sharp、V. Snieckus
DOI:10.1139/v94-035
日期:1994.1.1
The total synthesis of the naturally occurring fluorenone, dengibsinin (7a), and the azafluoranthene alkaloid, imeluteine (30e), is described. Using combined ortho metalation – crosscouplingsequences that terminate in Friedel–Crafts (18b → 6d) and remote metalation (21a,b → 6c,d) reactions, the synthesis of fluorenone dimethyl ethers 6c and 6d is reported. 6c and 6d were shown not to be identical
Remote aromatic metalation. An anionic Friedel-Crafts equivalent for the regioselective synthesis of condensed fluorenones from biaryl and m-teraryl 2-amides
作者:Jian Min Fu、Bao Ping Zhao、M. J. Sharp、V. Snieckus
DOI:10.1021/jo00005a004
日期:1991.3
Remote metalation (t-BuLi, LDA) of m-teraryl and biaryl amides (Scheme I) constitutes a short and convenient route to a variety of substituted and condensed fluorenones, including aza analogues (Table I) and the natural product, dengibsinin (6a, Scheme II).
SARGENT, MELVYN V., J. CHEM. SOC. PERKIN TRANS., 1,(1987) N 11, 2553-2563