Copper-Catalyzed [3 + 2] Annulation of O-Acyl Oximes with 4-Sulfonamidophenols for the Synthesis of 5-Sulfonamidoindoles and 2-Amido-5-sulfonamidobenzofuran-3(2H)-ones
A copper-catalyzed [3 + 2] annulation of O-acyl oximes with 4-sulfonamidophenols is developed. The advantage of this method lies in the concurrent double activation of two substrates to form nucleophilic enamines and electrophilic quinone monoimines. The substituent on the α-carbon of O-acyl oxime determines two different reaction pathways, thereby leading to the selective generation of 5-sulfonamidoindoles
开发了铜催化的O-酰基肟与 4-磺酰胺苯酚的 [3 + 2] 成环反应。该方法的优点在于同时双重活化两种底物,形成亲核烯胺和亲电醌单亚胺。 O-酰基肟的α-碳上的取代基决定了两种不同的反应途径,从而导致5-磺酰胺吲哚和2-酰胺基-5-磺酰胺苯并呋喃-3(2 H )-酮的选择性生成。
Zakatov, V.V.; Dubina, V.L.; Torubarnov, I.V., Russian Journal of Organic Chemistry, 1994, vol. 30, # 2, p. 303 - 306
作者:Zakatov, V.V.、Dubina, V.L.、Torubarnov, I.V.
DOI:——
日期:——
Thiocyanation of N-arylsulfonyl-, N-aroyl-, and N-[(N-arylsulfonyl)benzimidoyl]-1,4-benzoquinone imines
作者:A. P. Avdeenko、V. V. Pirozhenko、S. A. Konovalov、D. A. Roman’kov、G. V. Palamarchuk、O. V. Shishkinc
DOI:10.1134/s1070428009030105
日期:2009.3
Reactions of thiocyanate ion with N-aroyl-, N-arylsulfonyl-, and N-(N-arylsulfonylbenzimidoyl)-1,4-benzoquinone imines follow the 1,4-addition pattern, and the adducts undergo intramolecular cyclization to give the corresponding N-substituted 5-amino-1,3-benzoxathiol-2-ones as final products.
Halogenation of N-substituted para-quinone monoimine and para-quinone monooxime esters: VI. Regular trends in chlorination and bromination of N-arylsulfonyl-1,4-benzoquinone monoimines alkyl-substituted in the quinoid ring
作者:A. P. Avdeenko、S. A. Konovalova、O. N. Ludchenko
DOI:10.1134/s107042800605006x
日期:2006.5
Reactions of halogens with N-arylsulfonyl- 1,4-benzoquinone monoimines occur with the formation of a halogenonium ion that either transforms into a carbocation where the first halogen atom adds to the carbon in the ortho-position relative to the carbonyl carbon, or the halogenonium ion adds directly the second halogen atom.
Sakatow W. W., Dubina W. L., Torubarow I. W., Zh. organ. khimii, 30 (1994) N 2, S 288-290