Scope and Mechanism of the Ruthenium-Catalyzed Dehydrative C–H Coupling of Phenols with α,β-Unsaturated Carbonyl Compounds: Expedient Synthesis of Chromene and Benzoxacyclic Derivatives
作者:Bhanudas Dattatray Mokar、Chae S. Yi
DOI:10.1021/acs.organomet.9b00629
日期:2019.12.23
4-disubstituted chromene derivatives, whereas the analogous coupling with cyclic enones yielded 9-hydroxybenzoxazole products. The reaction of 3,5-dimethoxyphenol with PhCH═CHCDO resulted in the chromene product with a significant H/Dexchange to both benzylic and vinyl positions. The most significant carbon isotope effect from the coupling of 3,5-dimethoxyphenol with 4-methoxycinnamaldehyde was observed
ne烯和苯并氧杂环衍生物是通过苯酚与α,β-不饱和羰基化合物的钌催化脱水CH-H偶联反应有效合成的。发现阳离子钌氢化物络合物是有效的催化剂,可用于苯酚与烯类的偶联和环化,形成苯并二氢萘产品。苯酚与线性烯酮的偶合得到2,4-二取代的色烯衍生物,而与环烯酮的类似偶合产生9-羟基苯并恶唑产物。3,5-二甲氧基苯酚与PhCH = CHCDO的反应生成的苯并二氢萘产物在苯甲基和乙烯基位置均具有显着的H / D交换。3的偶合最显着的碳同位素效应 在色烯产物的α-烯烃碳上观察到5-二甲氧基苯酚与4-甲氧基肉桂醛(C(2)= 1.067)。3,5-二甲氧基苯酚与对位取代的p -XC 6 H 4 CH = CHCHO表现出线性相关性,并具有吸电子基团(ρ= +1.5; X = OCH 3,CH 3,H,F,Cl)的强促进作用。通过催化偶合法合成了几种具有生物活性的色酮衍生物。该催化方法提供了一种方便的合成方
Oxidation of 3-aryl-1H-benzo[f]chromenes with Koser’s reagent – synthesis of benzoflavylium tosylates
作者:Vitaly А. Osyanin、Maxim R. Demidov、Dmitry V. Osipov、Yuri N. Klimochkin
DOI:10.1007/s10593-020-02705-5
日期:2020.5
The oxidation of 3-aryl-1H-benzo[f]chromenes with Koser’s reagent in methanol afforded a series of benzoflavylium tosylates. This reaction is the first example of the use of polyvalent iodine compounds to access arene-condensed pyrylium salts.
用Koser试剂在甲醇中氧化3-芳基-1 H-苯并[ f ]色酮,得到了一系列苯并黄酮甲苯磺酸盐。该反应是使用多价碘化合物获得芳烃缩合的吡啶鎓盐的第一个例子。
Cyclopropanation of areno-condensed 4H-pyrans with dihalocarbenes
作者:Irina А. Semenova、Vitaly А. Osyanin、Maxim R. Demidov、Dmitry V. Osipov、Yuri N. Klimochkin
DOI:10.1007/s10593-020-02831-0
日期:2020.11
The addition of dihalocarbenes to 1H-benzo[f]chromenes and 4H-chromenes gave a number of dihalotetrahydro(benzo)cyclopropa[b]-chromenes containing donor and acceptor substituents at different positions. It was found that in the case of 1,3-disubstituted 1H-benzo[f]-chromenes, the reaction proceeds diastereoselectively with the formation of trans-isomers. 12H,13H-7a,12a-Methanobenzo[f]indeno-[1,2-b]chromene
向1 H-苯并[ f ]色烯和4 H-色烯中添加二卤卡宾,得到许多在不同位置含有供体和受体取代基的二卤四氢(苯并)环丙烷[ b ]-色烯。发现在1,3-二取代的1 H-苯并[ f ]-色烯的情况下,该反应非对映选择性地进行,形成反式异构体。12 H,13 H -7a,12a-甲基苯并[ f ]茚满-[1,2- b ]色烯和12,13-二氢-14 H -7a,13a-甲基二苯并[ a,h获得了新杂环系统代表的吨蒽。
Oxidative rearrangement of 3-aryl-1H-benzo[f]chromenes into 2-aroyl-1,2-dihydronaphtho[2,1-b]furans
作者:Kirill S. Korzhenko、Dmitry V. Osipov、Vitaly А. Osyanin、Maxim R. Demidov、Yuri N. Klimochkin
DOI:10.1007/s10593-021-02949-9
日期:2021.5
s with N-bromosuccinimide in aqueous acetone, a series of 2-aroyl-1,2-dihydronaphtho-[2,1-b]furans unsubstituted at the C-1 position were obtained as a result of formal addition of hypobromous acid to the pyran fragment and intramolecular nucleophilic substitution. This reaction is a rare example of the ring constriction in 1H-benzo[f]chromene series.
通过 3-芳基-1 H-苯并[ f ]色烯与N-溴代琥珀酰亚胺在丙酮水溶液中的反应,一系列 2-芳酰基-1,2-二氢萘基-[2,1- b ]呋喃在 C-作为次溴酸正式加成到吡喃片段和分子内亲核取代的结果,获得了第 1 个位置。该反应是 1 H-苯并[ f ] 色烯系列中缩环的罕见例子。
OJHA, N., J. INST. CHEM. (INDIA), 61,(1989) N, C. 111-113