3-乙氧基-2-烷基环丁酮和亚硝基苯之间的正式[4+2]环加成反应通过用Me 3 SiOTf活化得到6-烷基-2-苯基-2 H -1,2-恶嗪-5(6 H )-one通过区域选择性裂解环丁酮环上更多取代的 C2-C3 键。另一方面,3-苯基环丁酮和2-苄氧基环丁酮与亚硝基苯的反应分别通过环丁酮C1-C2键的断裂产生γ,δ-不饱和和环状异羟肟酸衍生物。
Friedel–Crafts Alkylation of Aromatics by TiCl4-Promoted Ring Cleavage of 3-Arylcyclobutanones
作者:Jun-ichi Matsuo、Mayu Kanie、Tomoyuki Yoshimura
DOI:10.1055/s-0036-1591497
日期:2018.2
his 90th birthday Abstract Ring cleavage of 3-arylcyclobutanones and successive Friedel–Craftsalkylation of methoxy- or alkyl-substituted benzene derivatives proceeded to give 3,3-diarylbutan-2-ones by activation with titanium tetrachloride. Ring cleavage of 3-arylcyclobutanones and successive Friedel–Craftsalkylation of methoxy- or alkyl-substituted benzene derivatives proceeded to give 3,3-diarylbutan-2-ones
Various 3-phenylcyclobutanones reacted with aliphatic and aromatic nitriles in the presence of Me3SiOTf to afford dihydropyridones by formal [4+2] cycloaddition.
A reaction of 3-arylcyclobutanones with anthracene in the presence of TiCl4 gave 14-aryl-9,10-dihydro-9,10-butanoanthracen-12-ones as a formal [4 + 4] cycloadduct of anthracenes with a C4 unit formed by cleaving the more substituted C2C3 bond of cyclobutanones. On the other hand, activation of 3-arylcyclobutanones with TfOH in the absence of nucleophiles gave 2-tetralones with skeletal rearrangement