已开发出一种温和的可见光诱导 4CzIPN/H +光氧化还原系统,使羟基酮能够通过正式的 C−O 键裂解充当碳自由基前体。该过程已成功用于 N-芳基丙烯酰胺的偶联/环化反应,从而为酰基羟吲哚提供了可行途径。该方案的优点包括不需要任何金属催化剂和添加剂、高产率、广泛的底物范围、克可扩展性以及 H 2 O 作为唯一副产物的释放。
Enantioselective Photocyclization of Acrylanilides and<b><i>N</i></b>-Ethyl-<b><i>N</i></b>-methylbenzoylformamide in Inclusion Crystals with (<b><i>R</i></b>,<b><i>R</i></b>)-(-)-[<b><i>trans</i></b>]-2,3-Bis(<b><i>α</i></b>-hydroxydiphenylmethyl)-1,4-dioxaspiro-[4.4]nonane and -[4.5]decane. Mechanistic Study Based on X-Ray Crystal Structure Analyses
作者:Shigeru Ohba、Hiroyuki Hosomi、Koichi Tanaka、Hisakazu Miyamoto、Fumio Toda
DOI:10.1246/bcsj.73.2075
日期:2000.9
enantioselectivities in photocyclization of cyclohex-1-enecarboic acid methyl-phenyl-amide (3), N-methyl, N-(E)-methylmethacryloyl}anilide (5), N-methyl, N-(methacryloyl)anilide (8), and N-ethyl-N-methylbenzoylformamide (10) are the result of their chiral conformations in the clathrate crystalline environment with the title chiral hosts [(-)-1 and (-)-2, respectively]. The chirality of acrylanilides and benzoylformamide
Cobalt-Catalyzed Reductive Carboxylation of α,β-Unsaturated Compounds with Carbon Dioxide
作者:Chika Hayashi、Takuo Hayashi、Tohru Yamada
DOI:10.1246/bcsj.20150043
日期:2015.6.15
The gaseous carbon dioxide incorporation reaction with α,β-unsaturated compounds was examined in the presence of a catalytic amount of bis(acetylacetonato)cobalt(II) and using diethylzinc as a redu...
在催化量的双(乙酰丙酮)钴 (II) 存在下,并使用二乙基锌作为还原剂,研究了气态二氧化碳与 α,β-不饱和化合物的掺入反应。
Control of the stereochemistry in the photocyclisation of acrylanilides to 3,4-dihydroquinolin-2(1H)-ones. Delicate dependence on the host compound
作者:Koichi Tanaka、Osamu Kakinoki、Fumio Toda
DOI:10.1039/c39920001053
日期:——
The stereochemistry of the photocyclisation of acrylanilides to 3,4-dihydroquinolin-2(1H)-ones is controlled almost completely by irradiation in a crystalline inclusion compound with an optically active host compound derived from tartaric acid; the configuration of the photocyclisation product is controlled delicately by two hosts with slightly different structures.
Visible-Light Mediated Metal-Free 6π-Photocyclization of <i>N</i>-Acrylamides: Thioxanthone Triplet Energy Transfer Enables the Synthesis of 3,4-Dihydroquinolin-2-ones
作者:Meghan J. Oddy、Daniel A. Kusza、Wade F. Petersen
DOI:10.1021/acs.orglett.1c03487
日期:2021.11.19
Iodo-Carbocyclization of Electron-Deficient Alkenes: Synthesis of Oxindoles and Spirooxindoles
Cyclisative carbo-iodination of N-alkyl-N-arylacrylamide derivatives (3) in the presence of PhI(OAc)(2)/I-2 afforded functionalized 3-(iodomethyl)-3-substituted-indolin-2-ones (4) in good to excellent yields. With a suitably functionalized linear amide, spirooxindole 8 was prepared in a one-pot fashion via a sequence of iodo-arylation followed by an in situ base-promoted intramolecular S(N)2 reaction.