功能化石墨氮化碳 (Sg-C 3 N 4 ) 已被制造并用作可重复使用的催化剂,用于在水介质中一锅法生产各种螺吡喃色烯和螺吲哚-3,1'-萘四环体系。超声辅助方法已用于 gC 3 N 4的功能化。通过不同的分析工具表征催化剂的催化功能和结构完整性。Sg-C 3 N 4的催化位点特异性作用通过一锅反应序列中的各种对照实验得到证实。我们认识到 Sg-C 3 N 4作为第一个反应序列的双功能酸碱催化剂,而在各种螺吡喃色烯的单锅生产过程中,它是第二个反应序列的酸性催化剂。此外,Sg-C 3 N 4的双功能酸碱催化作用对于第一个反应序列已被证实,而在螺吲哚-3,1'-萘四环体系的一锅法生产过程中,它对第二个反应序列具有基本催化作用。多种 C-C、C-O 和 C-N 键、六元环、立体中心和螺骨架在单一反应中形成,增强了杀菌性能,并可能导致发现新的药用特性。Sg-C 3 N 4的温和反应环境、简单的后处
Synthesis of functionalized chromene and spirochromenes using l -proline-melamine as highly efficient and recyclable homogeneous catalyst at room temperature
commercially cheap l-proline and melamine for the synthesis of chromenes and spirochromenes (spirooxindoles) via multicomponent reactions at room temperature. Systematic studies were conducted in order to achieve desired reactivity and recyclability of the catalyst using various α-amino acids and aromatic amines as donor-acceptor pairs. Among the screened combinations, l-proline and melamine (3:1 ratio;
CsF promoted rapid synthesis of spirooxindole‐pyran annulated heterocycles at room temperature in ethanol
作者:Yogesh B. Wagh、Swapnil A. Padvi、Pramod P. Mahulikar、Dipak S. Dalal
DOI:10.1002/jhet.3846
日期:2020.3
straightforward synthetic strategy for the construction of functionalized spirooxindole‐pyranannulatedheterocycles is described. The procedure is based on CsF‐promotedrapid tandem Knoevenagel‐Michael‐Cyclocondensation reaction of isatin, malononitrile, and 4‐hydroxycoumarin/barbituric acids/pyrazolone at roomtemperature in ethanol. This methodology has various advantages like easy operational, excellent
γ‐Valerolactone as a Promising Bio‐Compatible Media for One‐Pot Synthesis of Spiro[indoline‐3,4'‐pyrano[3,2‐
<i>c</i>
]chromene Derivatives
作者:Furqan Diwan、Mazahar Farooqui
DOI:10.1002/jhet.3351
日期:2018.12
A general, highly efficient, and green protocol for the synthesis of biologically important spiro[indoline‐3,4′‐pyrano[3,2‐c]chromene derivatives is developed by one‐pot, three‐component approach involving substituted isatin, active methylene group, and 4‐hydroxy coumarin. This report describes the use of γ‐valerolactone as a green reaction media for a variety of substrates. The advantageous features
通过一锅三组分方法开发了一种通用的,高效的绿色方案,用于合成生物学上重要的螺[吲哚啉-3,4'-吡喃并[3,2- c ]色烯衍生物亚甲基和4-羟基香豆素。该报告描述了将γ-戊内酯用作各种底物的绿色反应介质。该方法的优势在于环境友好,操作简单,高收率工艺(91%至96%),易于处理,并且反应介质可以循环使用多次,而不会显着降低其效率。
Site-specific role of bifunctional graphitic carbon nitride catalyst for the sustainable synthesis of 3,3-spirocyclic oxindoles in aqueous media
作者:Anshu Dandia、Dinesh Kumar Mahawar、Pratibha Saini、Surendra Saini、Shyam L. Gupta、Kuldeep S. Rathore、Vijay Parewa
DOI:10.1039/d1ra03881h
日期:——
Functionalized graphitic carbon nitride (Sg-C3N4) has been manufactured and used as a reusable catalyst for the one-pot production of various spiro-pyrano chromenes and spiro indole-3,1′-naphthalene tetracyclic systems in aqueous media. An ultrasound-assisted method has been used for the functionalization of g-C3N4. The catalytic functionalities and the structural integrity of the catalyst were characterized
功能化石墨氮化碳 (Sg-C 3 N 4 ) 已被制造并用作可重复使用的催化剂,用于在水介质中一锅法生产各种螺吡喃色烯和螺吲哚-3,1'-萘四环体系。超声辅助方法已用于 gC 3 N 4的功能化。通过不同的分析工具表征催化剂的催化功能和结构完整性。Sg-C 3 N 4的催化位点特异性作用通过一锅反应序列中的各种对照实验得到证实。我们认识到 Sg-C 3 N 4作为第一个反应序列的双功能酸碱催化剂,而在各种螺吡喃色烯的单锅生产过程中,它是第二个反应序列的酸性催化剂。此外,Sg-C 3 N 4的双功能酸碱催化作用对于第一个反应序列已被证实,而在螺吲哚-3,1'-萘四环体系的一锅法生产过程中,它对第二个反应序列具有基本催化作用。多种 C-C、C-O 和 C-N 键、六元环、立体中心和螺骨架在单一反应中形成,增强了杀菌性能,并可能导致发现新的药用特性。Sg-C 3 N 4的温和反应环境、简单的后处