Ru-Catalyzed Redox-Neutral Cleavage of the N–O Bond in Isoxazolidines: Isatogens to Pseudoindoxyls via a One-Pot [3 + 2]-Cycloaddition/N–O Cleavage
摘要:
A novel metal-catalyzed oxygen atom transfer reaction onto olefins is reported. By taking isatogens as substrates, a one-pot [3 + 2]-cycloaddition of nitrone with olefins followed by the Ru-catalyzed redox-neutral N-O bond cleavage of intermediate isoxazolidine has been executed as a simple method for the synthesis of 2,2-disubstituted pseudoindoxyls.
Sahasrabudhe, A. B.; Kamath, H. V.; Bapat, B. V., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1980, vol. 19, # 3, p. 230 - 232
Catalytic asymmetric formal [3+2] cycloaddition of isatogens with azlactones to construct indolin-3-one derivatives
作者:Lihua Xie、Yi Li、Shunxi Dong、Xiaoming Feng、Xiaohua Liu
DOI:10.1039/d0cc06418a
日期:——
A number of enantioenriched indolin-3-one derivatives were readily obtained by chiral guanidine-catalyzed [3+2] cycloaddition of isatogens with azlactones.
One-Pot Au[III]-/Lewis Acid Catalyzed Cycloisomerization of Nitroalkynes and [3 + 3]Cycloaddition with Donor–Acceptor Cyclopropanes
作者:Pawan S. Dhote、Chepuri V. Ramana
DOI:10.1021/acs.orglett.9b02035
日期:2019.8.16
tricyclic pseudoindoxyl scaffold from 2-nitroalkynylbenzenes, comprising of an Au(III)-catalyzed nitroalkyne cycloisomerization leading to isatogen and its [3 + 3]-cycloaddition with donor–acceptorcyclopropanes mediated by a suitable Lewisacid, has been developed.
InCl3-Mediated Addition of Indole to Isatogens: An Expeditious Synthesis of 13-deoxy-Isatisine A
作者:Chepuri V. Suneel Kumar、Vedavati G Puranik、Chepuri V. Ramana
DOI:10.1002/chem.201103604
日期:2012.7.27
has been developed. As a part of this strategy, methods for the addition of indoles to isatogens that lead selectively to either 2,2‐disubstituted N‐hydroxyindolin‐3‐one or 2,2‐disubstituted indolin‐3‐one compounds have been developed by employing InCl3 as a catalyst or as the reagent. The present methods provide the first examples of the additions of indoles to the isatogen nucleus. To demonstrate
Rh(III)-catalyzed C7-alkylation of isatogens (indolin-3-one N-oxides) with malonicacid diazoesters has been developed. This strategy utilizes oxygen anion on the N-oxide group of isatogens as a directing group and successfully achieves the synthesis of a series of C7-alkylated isatogens with moderate to good yields (48–86% yields). Moreover, the N-oxides of isatogens can not only serve as the simple
AuBr3-catalyzed cyclization of o-(alkynyl)nitrobenzenes. Efficient synthesis of isatogens and anthranils
作者:Naoki Asao、Kenichiro Sato、Yoshinori Yamamoto
DOI:10.1016/s0040-4039(03)01357-1
日期:2003.7
The cyclization of o-(arylalkynyl)nitrobenzenes was catalyzed by AuBr3 to produce the corresponding isatogens in good to high yields together with small amounts of anthranils. On the other hand, anthranils were obtained selectively when the AuBr3-catalyzed reaction was carried out using o-(alkylalkynyl)nitrobenzenes. (C) 2003 Elsevier Ltd. All rights reserved.