Rhodium(III)-Catalyzed Oxidative [3 + 2] Annulation of 2-Acetyl-1-arylhydrazines with Maleimides: Synthesis of Pyrrolo[3,4-b]indole-1,3-diones
摘要:
A rhodium-catalyzed oxidative [3 + 2] annulation of 2-acetyl-1-phenylhydrazines with maleimides was accomplished using AgNTf2 and Ag2CO3 as additive and oxidant, respectively. A variety of 2-acetyl-1-phenylhydrazines with maleimides were converted into pyrrolo[3,4-b]indole-1,3-diones in satisfactory to excellent yields. Synthetically useful functional groups, such as halogen atoms (F, Cl, Br, and I), ester, cyano, and nitro, remained intact during tandem C-H activation and annulation reactions.
Novel, Efficient and Regiospecific Alkylation/Arylation/Heteroarylation of Unsymmetrical Azo Compounds
作者:Uno Mäeorg、Olga Tšubrik、Rannar Sillard
DOI:10.1055/s-2006-926331
日期:——
Excellent regioselectivity is observed in the addition of diverse organometallic nucleophiles to unsymmetricalazocompounds. Primary/secondary/tertiary alkyl, aryl and heteroaryl substituents were introduced this way in high yields.
An efficient and ligand‐free palladium‐catalyzed arylation of benzofurans has been developed with N′ ‐acyl arylhydrazines as the coupling partners. This protocol features a wide functional‐group tolerance and highly regioselective products.
Reduction of Ag(I) by 1-acyl-2-arylhydrazines: Mechanism of photographic infectious development
作者:W. Russell Bowman、J. Anthony Forshaw、Kevin P. Hall、Jonathan P. Kitchin、Andrew W. Mott
DOI:10.1016/s0040-4020(96)00050-6
日期:1996.3
The photographic process of ‘infectious development’ in which 1-acyl-2-arylhydrazines reduce Ag(I) has been studied using analogues. 1-Acyl-2-aryldiazenes, resulting from oxidation of 1-acyl-2-arylhydrazines, are hydrolysed to anions of aryldiazenes (ArN=NH), which undergo further oxidation with loss of nitrogen to yield aryl radicals. The aryl radicals cause ‘feedback inhibition’ which is prevented
Synthesis of 1<i>H</i>-Indole-2,3-dicarboxylates via Rhodium-Catalyzed C–H Annulation of Arylhydrazines with Maleates
作者:Sheng Zhang、He Li、Yoshinori Yamamoto、Ming Bao
DOI:10.1021/acs.joc.0c01727
日期:2020.10.2
This work describes a one-step synthesis of 1H-indole-2,3-dicarboxylates through C–Hactivation. Rhodium-catalyzed tandem C–Hactivation and annulation of 2-acetyl-1-phenylhydrazines with maleates proceeded smoothly in the presence of additive NaOAc and oxidant Ag2CO3 and produced the corresponding indole derivatives, 1H-indole-2,3-dicarboxylates, in satisfactory to good yields. A variety of useful
这项工作描述了通过C–H活化的1 H-吲哚-2,3-二羧酸酯的一步合成。在添加剂NaOAc和氧化剂Ag 2 CO 3的存在下,铑催化的串联C–H活化和2-乙酰基-1-苯基肼与马来酸酯的环合反应顺利进行,并产生了相应的吲哚衍生物1 H-吲哚-2,3-二羧酸盐,令人满意的好收率。苯环上可耐受各种有用的官能团,包括卤素原子(F,Cl,Br和I)和甲氧羰基。
Sc(OTf)<sub>3</sub>-Mediated [4 + 2] Annulations of <i>N</i>-Carbonyl Aryldiazenes with Cyclopentadiene to Construct Cinnoline Derivatives: Azo-Povarov Reaction
作者:Xabier Jiménez-Aberásturi、Francisco Palacios、Jesús M. de los Santos
DOI:10.1021/acs.joc.2c01224
日期:2022.9.2
We disclose the first accomplishment of the azo-Povarov reaction involving Sc(OTf)3-catalyzed [4 + 2] annulations of N-carbonyl aryldiazenes with cyclopentadiene in chloroform, in which N-carbonyl aryldiazenes act as 4π-electron donors. Hence, this protocol offers a rapid access to an array of cinnoline derivatives in moderate to good yields for substrates over a wide scope. The synthetic potential