Commercially available liquid enol ethers and acetates as gaseous alkyne equivalents in cationic Rh(I)/BINAP-catalyzed chemo- and regioselective formal cross-alkyne cyclotrimerizations.
英文:
Commercially available liquid enol ethers and acetates as gaseous alkyne equivalents in cationic Rh(I)/BINAP-catalyzed chemo- and regioselective formal cross-alkyne cyclotrimerizations.
A cationic rhodium(I)/BINAP complex catalyzes partial intramol. [2+2+2] cycloaddns. of 1,6- and 1,7-diynes with enol ethers or a ketene acetal giving substituted benzenes, e.g. I, in good yields. The same catalyst also catalyzes complete intermol. [2+2+2] cycloaddns. of two different monoynes with enol acetates giving tri- and tetrasubstituted benzenes, e.g. II, in good yields with complete regioselectivity. Com. available liq. enol ethers and acetates can be used as versatile equiv. for gaseous alkynes in the present rhodium-catalyzed formal cross-alkyne cyclotrimerizations. [on SciFinder(R)]
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