已开发出一种有效的锡粉促进的2-甲酰基苯甲酸,酰肼和烯丙基溴的级联缩合/烯丙基化/内酰胺化反应,可在温和条件下以良好至极佳的收率合成异吲哚啉酮,而无需任何其他添加剂或催化剂。通过碘环化过程进一步操作异吲哚啉酮,得到三环四氢-8 H-吡唑并[5,1- a ] isoindol -8-one衍生物,可以将其转化为更复杂的四环四氢-4 H -azirino [1',2' :2,3] pyrazolo [5,1- a ] isoindol-4-ones。
An electrochemical protocol for the construction of substituted isoindolinones via reduction/amidation of 2-carboxybenzaldehydes and amines has been realized. Under metal-free and external-reductant-free electrolytic conditions, the reaction achieves the cascade formation of intermolecular C–N bonds and provides a series of isoindolinones in moderate to good yields. The deuterium-labeling experiment
Synthesis of 1‐(3
<i>H</i>
)isobenzofuranone compounds by tin powder promoted cascade condensation reaction
作者:Shangxian Wang、Ke‐Hu Wang、Bo Chang、Danfeng Huang、Yulai Hu
DOI:10.1002/aoc.6249
日期:2021.7
An efficient approach for the construction of phthalide compounds is developed through tin powder mediated cascade condensation reaction of 2-formylbenzoic acids with allyl bromides or α-bromoketone under mild reaction conditions. This method is easy to operate and can tolerate various functional groups to give the corresponding phthalides in good to excellent yields. The phthalides produced from α-bromoketone
通过锡粉介导的 2-甲酰基苯甲酸与烯丙基溴或α-溴酮在温和反应条件下的级联缩合反应,开发了一种有效的邻苯二甲酸酯化合物构建方法。该方法操作简单,可以耐受各种官能团,从而以良好到极好的收率得到相应的邻苯二甲酸酯。由α-溴酮生产的邻苯二甲酸酯可进一步转化为3,3a -dihydro -8 H -pyrazolo [5, l - a ]isoindol-8-one和8 H -pyrazolo[5, l- a ]isoindol-8-一。
Synthesis of chiral isoindolinones via asymmetric propargylation/lactamization cascade
作者:Jiao-Long Meng、Tang-Qian Jiao、Ya-Heng Chen、Rui Fu、Shu-Sheng Zhang、Qian Zhao、Chen-Guo Feng、Guo-Qiang Lin
DOI:10.1016/j.tetlet.2018.03.024
日期:2018.4
A Zn-mediated propargylation/lactamization cascade reaction with chiral 2-formylbenzoate derived N-tert-butanesulfinyl imines was realized, which provided a practical and efficient method for the synthesis of chiralisoindolinones. High diastereoselectivities (up to 97:3 dr) and good reaction yields were observed for most examined cases.
2-diamine with methyl 2-formylbenzoate catalyzed by a chiral phosphoric acid represents the first efficient method for the preparation of medicinally interesting chiral 2,3-dihydro-1H-imidazo[2,1-a]isoindol-5(9bH)-ones with high yields and excellent enantioselectivities. This strategy has been shown to be quite general toward various methyl 2-formylbenzoates.
手性磷酸催化N 1-烷基乙烷-1,2-二胺与2-甲酰基苯甲酸甲酯的高对映选择性催化不对称分子内级联酰亚胺化-亲核加成-内酰胺化是制备具有医学意义的手性2,3-手性化合物的第一种有效方法二氢-1 H-咪唑并[2,1- a ] isoindol-5(9b H)-具有高收率和优异的对映选择性。已经显示出该策略对于各种2-甲酰基苯甲酸甲酯是相当普遍的。
Reactions of carbonyl compounds in basic solutions. Part 24.1 The mechanism of the base-catalysed ring fission of substituted benzocyclobutene-1,2-diones
作者:Keith Bowden、M. Vahid Horri
DOI:10.1039/a606310a
日期:——
The rate coefficients for the base-catalysed ring fission of a
series
of substituted benzocyclobutenediones to give the corresponding
2-formylbenzoic acids have been determined in water at 25.0 and
60.0 °C. The effects of 4-substituents and
4,5-di-substituents on the rates have been correlated using a modified
Hammett equation to give a reaction constant, ρ, equal to
ca. 3.6 at 25.0 °C. The activation
parameters have been calculated. The effect of solvent composition on
the rates has been studied. The kinetic solvent isotope effect, product
composition and enrichment in 18O-enriched water have
also been studied. All the evidence indicates a mechanistic pathway
which proceeds by rapid reversible addition of hydroxide anion to the
dione, followed by intramolecular nucleophilic attack on the second
carbonyl group and formation of a carbanionic intermediate.