Gold(I)-Catalyzed Synthesis of 3-Sulfenyl Pyrroles and Indoles by a Regioselective Annulation of Alkynyl Thioethers
作者:Peter E. Simm、Prakash Sekar、Jeffery Richardson、Paul W. Davies
DOI:10.1021/acscatal.1c01457
日期:2021.6.4
synthesis. Accessing more varied heterocycle-substitution patterns by maintaining the same reaction pathways across different alkynes remains a challenge. Here we show that Au(I) catalysis of isoxazole-based nitrenoids with alkynyl thioethers provides controlled access to (3 + 2) annulation by a regioselective addition β to the sulfenyl group. The reaction with isoxazole-containing nitrenoids delivers
Synthesis and antiviral activity of 4-chloro-5-hydroxy-2-isoxazoline derivatives
作者:S. D. Sokolov、S. M. Vinogradova、V. S. Ignatov、V. V. Paramonova、I. S. Nikolaeva、N. S. Bogdanova、G. N. Pershin
DOI:10.1007/bf00758666
日期:1981.12
The reac t ion is ex t re m e l y sens i t ive to the e lec t ronic effects of the subst i tuents ; a ccep t er groupings (NO 2, COOH, H3N ) not only in the he te rocyc l i c , but also in the benzene r ing of a ry l i soxazo l es [3], and a lso in the side chain of me thy l i soxazo les , hinder addition to the .C4--C 5bond. The reac t ion can be ca rr i ed out with t r i subs t i tu ted i soxazo
1964 年,第一个简短的交流出现在将次氯酸添加到异唑环 [1] 和加合物的形式上,最近严格确认了结构为 4氯 5 羟基 2 异恶唑啉已被划线 [2]。在发现所得化合物的生物活性后,我们详细研究了各种异恶唑在含羟基溶剂中的氯化。该反应对替代物的电子效应极为敏感;一个ccept ter group (NO 2, COOH, H3N ) 不仅在杂环中,而且在 ry li soxazo les 的苯环中 [3],以及在甲基 li soxazo 的侧链les ,阻碍了.C4--C 5 键的加成。反应可以用三取代的异恶唑进行,在环的任何位置都有甲基或苯基(在 4 位也可以有氯原子)。3,5-二取代异恶唑首先在C 4 a 原子处氯化,然后进入加成反应离子。所得化合物的数据列于表 1。o~
Efficient and convenient method for the synthesis of isoxazoles in ionic liquid
作者:Hassan Valizadeh、Mohammad Amiri、Hamid Gholipur
DOI:10.1002/jhet.20
日期:2009.1
An efficient one-pot synthesis of 3,5-disubstitueted isoxazoles from β-diketones in room temperature ionicliquids (ILs) is described. Compared with the classical reaction conditions, this new synthetic method is environmentally friendly and has the advantages of recyclability of IL and very good to excellent yields. J. Heterocyclic Chem., (2009).
Suzuki-Miyaura cross-coupling of 3,4-disubstituted 5-bromoisoxazoles: An efficient access to trisubstituted isoxazoles
作者:Masato Tsuda、Taiki Morita、Hiroyuki Nakamura
DOI:10.1016/j.tetlet.2021.153185
日期:2021.7
The Suzuki-Miyaura cross-coupling of 3,4-disubstituted 5-bromoisoxazoles 1 at the C5 position has successfully proceeded in the presence of Pd2(dba)3 and P(t-Bu)3·HBF4 catalysts to give the corresponding trisubstituted isoxazoles 3 in good to high yields while suppressing the formation of ketone 4 as a byproduct. The use of bulky phosphine ligand P(t-Bu)3·HBF4 is essential for the current transformation
application of FeCl2 as an inexpensive, nontoxic, and efficient catalyst in a clean ringexpansion reaction of 2H-azirine derivatives, an intermediate formed through the PhI(OAc)2-mediated azirination of readily available enaminones. An alternative one-pot protocol for the synthesis of various substituted isoxazoles from their corresponding enaminones has been further established based on this reaction