钝化立体化学结果 a partir des cis-et trans-phenyl-5 diazo-5 pentenes, trans-diphenyl-1,4 dizo-4 butene-1 et cis-methyl-3 aryl-6 diazo-6 hexenes-3 montrent que les 反应 de cycloaddition-1,1 和retrocycloaddition-1,1 sont 立体选择性 avec 保留 de configuration total。分析 芳基-5 重氮-5 甲基-2 戊烯-2 反应电影
Au nanoparticlessupported on TiO2 (1 mol %) catalyze the quantitative cycloisomerization of conjugated allenones into furans under very mild conditions. The reaction rate is accelerated by adding acetic acid (1 equiv), but the acid does not participate in the protodeauration step as in the corresponding Au(III)-catalyzed transformation. The process is purely heterogeneous, allowing thus the recycling
Formal metal-free γ-arylation of 1,3-dicarbonyl compounds <i>via</i> an isomerisation/1,4-addition/[3,3]-sigmatropic rearrangement sequence
作者:Shi-Chao Lu、Fu-Qiang Wen、Xi-Dong Guan
DOI:10.1039/d1gc02856a
日期:——
metal-free redox arylation of alkynes with sulfoxides has been developed to provide unconventional access to diverse γ-arylated 1,3-dicarbonyl compounds in an atom-economical manner. Mechanistic studies suggest that a conjugated allenone intermediate was generated in situ, which solves the problem of reactivity and regioselectivity of unsymmetrical dialkyl-substituted internalalkynes and enables the functionalisation
Indium-mediated highly regioselective reaction of prop-2-ynyl bromides with acyl cyanides in aqueous media: a convenient synthesis of allenic and propargylic ketones
作者:Byung-Woo Yoo、Sung-Jae Lee、Kwang-Hyun Choi、Sam-Rok Keum、Jae-Jung Ko、Kyung-Il Choi、Joong-Hyup Kim
DOI:10.1016/s0040-4039(01)01494-0
日期:2001.10
Indium-mediatedreaction of acyl cyanides 1 with prop-2-ynyl bromides 2 in aqueousmedia occurs regioselectively to afford either allenic 3 or propargylic ketones 4 depending on the γ-substituent of the prop-2-ynyl bromide under the mild conditions.