the total synthesis of (±)‐gephyrotoxin has been developed. The key to success was the utilization of N‐methoxyamides, which enabled the direct coupling of the amide with an aldehyde and selective reductive nucleophilic addition to the amide in the presence of a variety of sensitive and electrophilic functional groups, such as a methyl ester. This chemoselective approach minimized the use of protecting‐group
O-Methyl oximes have been employed as nucleophiles in reactions with ketenimines derived from sulfonylazides and terminal alkynes to form N-alkylidene N′-tosylacetimidamide derivatives. The optimized conditions involved the use of CuPF6 and i-Pr2NEt in MeCN at 65 °C. Both O-methyl aldoximes and ketoximes were tolerated under the optimum conditions.
Indium-assisted aluminium-based stereoselective allylation of prostereogenic α,α-disubstituted cycloalkanones and imines
作者:Chennakesava Reddy、Srinivasarao Arulananda Babu、Nayyar Ahmad Aslam
DOI:10.1039/c4ra04293j
日期:——
Al0 for the allylation of a variety of prostereogenic α,α-disubstituted (hindered) cycloalkanones, 1,2-dione-based systems and various imino systems (CN functional groups) is reported. The stereoselective InCl3-catalyzed Al-based allylation of various 2-substituted-2-carbethoxycycloalkanones gave the corresponding products with moderate to excellent diastereoselectivity. The allylation and propargylation
ortho-Olefination of Arylaldehyde O-Methyloximes through Palladium-Catalyzed C-H Activation
作者:Zhipeng Xu、Biao Xiang、Peipei Sun
DOI:10.1002/ejoc.201200393
日期:2012.6
Palladium(II)-catalyzed ortho-olefination of arylaldehydeO-methyloximes by using O-methyloxime as a directing group gave 2-alkenylarylaldehyde O-methyloximes in moderate to good yields. After various reaction parameters (catalyst, oxidant, solvent, and reaction temperature) were examined, the optimal conditions for the reaction were identified. 2-Alkenylarylaldehydes could be obtained conveniently
通过使用 O-甲基肟作为导向基团,钯 (II) 催化芳基醛 O-甲基肟的邻-烯烃化反应以中等至良好的产率得到 2-烯基芳基醛 O-甲基肟。在检查了各种反应参数(催化剂、氧化剂、溶剂和反应温度)后,确定了反应的最佳条件。2-烯基芳醛可以通过偶联产物的水解方便地获得。提供了 C-H 键活化的动力学同位素效应 (kH/kD),并提出了反应的可能机制。
Synthesis of 2-aryl quinazolines from (2-aminophenyl)methanol and oxime ether catalyzed by copper ferrite nanoparticles
作者:Sachin A. Sarode、Vilas G. Jadhav、Jayashree M. Nagarkar
DOI:10.1016/j.tetlet.2017.01.037
日期:2017.2
Magnetically separable copper ferrite nps as a catalytic system, under solvent free reaction condition for synthesis of 2-arylquinazolines has been reported. (2-aminoaryl)methanols and various types of oximeethers were efficiently converted into desired products in moderate to good yields. This protocol offers a greener and atom efficient process, using recyclable heterogeneous catalytic system.