Lewis acid promoted decomposition of unsaturated .alpha.-diazo ketones. 3. Stereochemical consequences of polyolefinic cyclizations initiated by the .alpha.-diazo ketone functionality
Lewis acid promoted decomposition of unsaturated .alpha.-diazo ketones. 3. Stereochemical consequences of polyolefinic cyclizations initiated by the .alpha.-diazo ketone functionality
synthesis of functionalized alkyl aryl ketones is reported. Studies on the electronic and steric properties of mixed aryl anhydrides indicated that the cross-coupling favored with the electron-enriched aryl acyl group. DFT calculation on the oxidative addition of Pd(II) with 2,4,6-(Cl)3C6H2CO2C(O)Ph suggested that 2,4,6-(Cl)3C6H2C(O)–O bond cleavage was more kinetically disfavored than that of the PhC(O)–O
报道了钯/降冰片烯催化的邻位酰化,用于有效合成官能化的烷基芳基酮。对混合的芳基酸酐的电子和空间特性的研究表明,交叉偶联有利于富电子的芳基酰基。用2,4,6-(Cl)3 C 6 H 2 CO 2 C(O)Ph氧化Pd(II)的DFT计算表明2,4,6-(Cl)3 C 6 H 2 C (O)–O键的断裂在动力学上比PhC(O)–O键的断裂更不利于11.7 kJ / mol。
Iridium Acylnitrenoid-Initiated Biomimetic Cascade Cyclizations: Stereodefined Access to Polycyclic δ-Lactams
azacycles by a biomimetic cascade cyclization of arylalkenyl dioxazolones. This cascade reaction was found to proceed with excellent stereoselectivity and a high functional group tolerance. The substrate scope of arylalkenyl dioxazolones turned out to be highly flexible and extendable to additional terminating subunits, such as heteroaryl and alkynyl moieties. This biomimeticcyclization was elucidated