Iron-Catalyzed C-Allylating Partial Dearomatization of Naphthols
摘要:
The iron complex Bu4N[Fe(CO)(3)(NO)](TBA[Fe]) catalyzes the intermolecular allylation of naphthol derivatives to give the corresponding partially dearomatized allylated chromenones in good to excellent yields. The scope and limitations are reported. An efficient decarboxylative intramolecular C- allylation, starting from allyl naphthyl carbonates, was developed. From a mechanistic point of view, the overall process is the result of a fast O- allylation followed by a sigmatropic rearrangement to the desired product.
A simple and selective C-alkylation of 1- and 2-naphthols with benzylic and allylic halides was developed. In an organic solvent, like cyclopentyl methyl ether, or toluene in the presence of the ether or alcohol additives, a selective ortho-addition leading to substituted naphthalenones up to 90 % was achieved.
Photochemistry of 1-allyl-naphthalen-2(1H)-ones: A revised mechanism for the formation of benzotricyclo[3.3.1.02,7]nonen-8-ones.
作者:Niall W.A. Geraghty、Michael J. Monaghan、Noreen M. Hanley
DOI:10.1016/s0040-4039(00)96611-5
日期:1987.1
The photochemistry of a series of 1-alkenyl-naphthalen-2(1H)-ones suggests that the formation of benzotricyclo[3.3.1.02,7]nonen-8-ones involves an ambident benzyl radical which gives these products on ring closure at the cyclic carbon; ring closure at the cyclic carbon gives the normal [2+2] enone-olefin cycloaddition products.