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
trans-phenyl-5 diazo-5 pentenes, trans-diphenyl-1,4 diazo-4 butene-1 et cis-methyl-3 aryl-6 diazo-6 hexenes-3 montrent que les reactions de cycloaddition-1,1 et retrocycloaddition-1,1 sont stereoselectives avec retention de configuration totale. Analyse cinetique des reactions des aryl-5 diazo-5 methyl-2 pentenes-2
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
Cycloisomerization of Conjugated Allenones into Furans under Mild Conditions Catalyzed by Ligandless Au Nanoparticles
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
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.