Silica-bonded 5-n-propyl-octahydro-pyrimido[1,2-a]azepinium chloride (SB-DBU)Cl as a highly efficient, heterogeneous and recyclable silica-supported ionic liquid catalyst for the synthesis of benzo[b]pyran, bis(benzo[b]pyran) and spiro-pyran derivatives
The reaction of 3-chloropropyl silica (SilprCl) with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in dry acetone affords silica-bonded 5-n-propyl-octahydro-pyrimido[1,2-a]azepinium chloride (SB-DBU)Cl as a new silica-supported ionicliquid catalyst. Afterward, (SB-DBU)Cl is used for the efficientsynthesis of 4H-benzo[b]pyran derivatives via the one-pot, three-componentreaction of carbonyl compounds (cyclohexane-1
3-氯丙基二氧化硅(SilprCl)与1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)在干燥的丙酮中的反应得到二氧化硅键合的5-正丙基-八氢-嘧啶基[1,2- a]氯化ze嗪(SB-DBU)Cl作为新型的二氧化硅负载型离子液体催化剂。之后,(SB-DBU)Cl通过羰基化合物(环己烷-1,3-二酮,5,5-一锅法)的三锅法有效合成4 H-苯并[ b ]吡喃衍生物。(1,3-二甲基环己烷-1,3-二酮或3-甲基-1-苯基-2-吡唑啉-5-酮)与芳族醛和烷基丙二酸酯。此外,一些新颖的双(苯并[ b使用(SB-DBU)Cl合成[] pyran] s和在结构上含有羟吲哚和/或喹喔啉部分的多种结构多样的螺-吡喃。将催化剂循环使用十五次,收率不变。
Evaluation of magnetically recyclable nano-Fe3O4 as a green catalyst for the synthesis of mono- and bis-tetrahydro-4H-chromene and mono and bis 1,4-dihydropyridine derivatives
Magnetically separable Fe3O4 nanoparticles were used as an environmental friendly catalyst for the synthesis of mono- and bis-tetrahydro-4H-chromene and mono- and bis-1,4-dihydropyridine derivatives via three-component reactions of aromatic aldehydes and malononitrile with cyclic β-dicarbonyls or cyclic β-enaminoketones respectively. These reactions were carried out in EtOH and at reflux. Fe3O4 nanoparticles can be magnetically separated from the reaction mixture by a magnet and recycled without significant loss of catalytic activity.
Silica bonded n-propyl-4-aza-1-azoniabicyclo[2.2.2]octane chloride (SB-DABCO): A highly efficient, reusable and new heterogeneous catalyst for the synthesis of 4H-benzo[b]pyran derivatives
3-chloropropyl silica with diazabicyclo[2.2.2]octane in dry acetone affords silica bonded n-propyl-4-aza-1-azoniabicyclo[2.2.2]octane chloride (SB-DABCO) as a new basic catalyst. The catalyst is used for the efficientsynthesis of 4H-benzo[b]pyranderivatives via one-pot three-component reaction of cyclic ketones/1,3-diketones with aromatic aldehydes and alkylmalonates.
3-氯丙基二氧化硅与二氮杂双环[2.2.2]辛烷在干燥丙酮中的反应提供了与二氧化硅键合的正丙基-4-氮杂-1-氮杂双环[2.2.2]辛烷氯化物(SB-DABCO),作为一种新的碱性催化剂。通过环酮/ 1,3-二酮与芳族醛和丙二酸烷基酯的一锅三组分反应,该催化剂可用于高效合成4 H-苯并[ b ]吡喃衍生物。
Controlled Modification of Triaminoguanidine-Based μ<sub>3</sub> Ligands in Multinuclear [V<sup>IV</sup>O]/[V<sup>V</sup>O<sub>2</sub>] Complexes and Their Catalytic Potential in the Synthesis of 2-Amino-3-cyano-4<i>H</i>-pyrans/4<i>H</i>-chromenes
作者:Mannar R. Maurya、Naveen Kumar、Fernando Avecilla
DOI:10.1021/acs.inorgchem.3c03704
日期:2024.2.5
equiv to the reaction applied for 5 and 6. Keeping the reaction mixture of 1 in MeOH under air gave [VVO(H2L1’)(OMe)] (9). Structures of 3, 7, 8, and 9 were confirmed by X-ray crystal structure study. A permanent porosity in the crystalline metal–organic framework of 7 confirmed by single-crystal X-ray investigation was further verified by the BET study. Along with a suitable reactionmechanism, these synthesized
三(2-羟基亚苄基)-三氨基胍氯化物 ( I ·HCl) 和三(5-溴-2-羟基亚苄基)-三氨基胍氯化物 ( II ·HCl) 与 [V IV O(acac) 2 ] (1:1 摩尔)的反应比例)在回流甲醇中产生单核 [V IV O] 配合物,[V IV O(H 2 L 1' )(MeOH)] ( 1 ) 和 [V IV O(H 2 L 2' )(MeOH)] ( 2 ),分别,其中I和II经历分子内三唑环形成。在 Cs 2 CO 3存在下,在 MeOH 中空气氧化1和2,得到相应的顺式-[V V O 2 ] 配合物 Cs[(VO 2 )(H 2 L 1' )] ( 3 ) 和 Cs[(VO 2 ) )(H 2 L 2′ )]( 4 )。然而,空气氧化的 [V IV O(acac) 2 ] 甲醇溶液与I ·HCl 和II ·HCl 在 Cs 2 CO 3存在下(摩尔比为 1:1:1)反应,得到单核配合物
Tropine-based dicationic molten salt: An active catalyst in the acceleration of one-pot synthesis of spiro-2-amino-4H-pyran-oxindoles and bis-2-amino-4H-pyrans