Substituted 1,3-cyclohexadiene synthesis by NHC–Nickel(0) catalyzed [2+2+2] cycloaddition of 1,n-Enyne
2015
Zhao, Jian-Ping | Chan, Siu-Chung | Ho, Chun-Yu
This paper describes a catalytic and selective synthesis of substituted 1,3-cyclohexadiene fused with xH-pyran and furan. By using terminal enynes as substrates, NHC–Ni(0) as catalyst, and an ether as spacer between the two unsaturated hydrocarbon termini, the system competed with the terminal alkyne cyclotrimerization and yielded the desired [2+2+2] cycloaddition.
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