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1 Results The chromium-templated benzannulation of arylcarbenes by alkynes provides a direct regio- and diastereoselective access to densely functionalized chromium arenes[1]. The chromium fragment undergoes a haptotropic migration along the π-face of the fused arenes which can be controlled by thermodynamics,by the substitution pattern of the arene and by the metal coligand sphere(See Scheme 1).The controlled regioselective labeling of benzene rings can be exploited in diastereoselective C-C bond formation as demonstrated for [4+2] cycloaddition reactions[2].
1 Results The chromium-templated benzannulation of arylcarbenes by alkynes provides a direct regio- and diastereoselective access to densely functionalized chromium arenes [1]. The chromium fragment undergoes a haptotropic migration along the π-face of the fused arenes which can be controlled by thermodynamics , by the substitution pattern of the arene and by the metal coligand sphere (See Scheme 1). The controlled regioselective labeling of benzene rings can be exploited in diastereoselective CC bond formation as demonstrated for [4 + 2] cycloaddition reactions [2].