Synthesis of new aza-bicyclic 2-isoxazolines by 1,3-dipolar cycloaddition of endocyclic enecarbamates and enamides with nitrile oxides
作者:Valderes Moraes de Almeida、Rosiel José dos Santos、Alexandre José da Silva Góes、José Gildo de Lima、Carlos Roque Duarte Correia、Antônio Rodolfo de Faria
DOI:10.1016/j.tetlet.2008.11.096
日期:2009.2
4-b]pyrrolidines, and 4,5-dihydroisoxazole[5,4-b]piperidines were synthesized in a highly regioselective manner through a 1,3-dipolar cycloaddition reaction of 5- and 6-membered endocyclic enecarbamates and enamides with several nitrile oxides in good to excellent yields. Hydrogenolysis of 5- and 6-membered Cbz-cycloadducts led to secondary amines, which presented distinctive stabilities. 2-Isoxazoline
新型的氮杂双环2-异恶唑啉,4,5-二氢异恶唑[5,4- b ]吡咯烷和4,5-二氢异恶唑[5,4- b ]哌啶以高度区域选择性的方式通过1,3-偶极合成5元和6元环内氨基甲酸酯和酰胺与几种腈氧化物的环加成反应,收率良好或优异。5元和6元Cbz-环加合物的氢解反应生成仲胺,具有独特的稳定性。通过N-苯甲酰化,然后仲胺的氨解,或直接从环加合物的氨解,以高收率获得了2-异恶唑啉双酰胺。
Lewis acid-catalyzed reaction between tertiary enamides and imines of salicylaldehydes: expedient synthesis of novel 4-chromanamine derivatives
作者:Ling He、Han-Bin Liu、Liang Zhao、De-Xian Wang、Mei-Xiang Wang
DOI:10.1016/j.tet.2014.12.050
日期:2015.1
catalytic amount of Zn(OTf)2 in DCE at ambient temperature, a number of tertiary enamides underwent highly efficient reaction with imines of salicylaldehydes to afford diverse functionalized 4-chromanamine derivatives in high yields. The reaction proceeds most probably through an enaminic addition of tertiary enamides to imine functionality followed by the intramolecular interception of the resulting iminium
Catalytic Asymmetric Difunctionalization of Stable Tertiary Enamides with Salicylaldehydes: Highly Efficient, Enantioselective, and Diastereoselective Synthesis of Diverse 4-Chromanol Derivatives
作者:Ling He、Liang Zhao、De-Xian Wang、Mei-Xiang Wang
DOI:10.1021/ol5029964
日期:2014.11.21
BINOL–Ti(OiPr)4 complex, various stable tertiaryenamides reacted with salicylaldehydes to afford diverse cis,trans-configured 4-chromanols that contain three continuous stereogenic centers in good yields with excellent diastereoselectivity and enantioselectivity. The reaction proceeded through the addition of enamide to aldehyde followed by the intramolecular interception of the resulting iminium by
在手性BINOL-Ti(O i Pr)4配合物的催化下,各种稳定的叔酰胺与水杨醛反应,得到各种顺式,反式构型的4-苯并三酚,其中三个连续的立体构型中心,收率高,具有非对映选择性和对映选择性。该反应通过向烯醛中添加烯酰胺,然后通过羟基分子内截留所生成的亚胺来进行。氧化所得的4-色醇,得到几乎定量的苯并四氢吡喃-4-酮衍生物,用NaBH 4进行非对映特异性还原,生成顺式,顺式构型的4-色醇。
10.1021/acs.joc.4c00855
作者:Jiang, Hong-Xia、Wang, Zhong-Xia
DOI:10.1021/acs.joc.4c00855
日期:——
Palladium-catalyzed reaction of indolines with 1-acyl-2,3-dihydro-1H-pyrroles or 1-acyl-2,5-dihydro-1H-pyrroles in air produces N-alkylated indoles. A combination of Pd(CH3CN)2Cl2 and dppf effectively catalyzes the reaction of 1-acyl-2,3-dihydro-1H-pyrroles, and the combination of Pd(CH3CN)2Cl2 and dcypf is more effective for the reaction of 1-acyl-2,5-dihydro-1H-pyrroles. The method has a wide scope