Synthesis of naphthoquinone antibiotics by intramolecular alkyne cycloaddition to carbene-chromium complexes
作者:M.F. Semmelhack、Joseph J. Bozell、Leonard Keller、Tadahisa Sato、E.J. Spiess、W. Wulff、A. Zask
DOI:10.1016/s0040-4020(01)91420-6
日期:1985.1
The reaction of carbene-chromium complexes with alkynes provides a direct route to naphthoquinone derivatives and is the key step in a new approach to the isochromanone antibiotics exemplified by deoxyfrenolicin (1) and nanaomycin A (2). While the regioselectivity of intermolecular addition of the appropriate unsymmetrical disubstituted alkyne is unfavourable, two successful approaches have been developed