Ordered short channel mesoporous silica modified with 1,3,5-triazine–piperazine as a versatile recyclable basic catalyst for cross-aldol, Knoevenagel and conjugate addition reactions with isatins
作者:Naveen Gupta、Tamal Roy、Debashis Ghosh、Sayed H. R. Abdi、Rukhsana I. Kureshy、Noor-ul H. Khan、Hari C. Bajaj
DOI:10.1039/c5ra00406c
日期:——
A recyclable triazine–piperazine immobilized silica supported material was explored as a heterogeneous catalyst for indole skeletal synthesized from isatins at RT.
Ketone–ketone cross-aldolreaction of isatins and unactivated ketones was catalyzed by glucose-containing imidazolium salt β-1-imidazole-2,3,4,6-tetra- o -hydroxy- d -glucopyranosyl bromide in neutral condition to generate 3-alkyl-3-hydroxyindolin-2-ones in excellent yield.
含葡萄糖的咪唑鎓盐β-1-咪唑-2,3,4,6-四氢呋喃-丁酮催化靛红与未活化酮的酮-酮交叉羟醛反应。 Ø -羟基- d -葡糖吡喃糖基溴在中性条件下生成3-烷基-3-羟基吲哚-2-酮的产率很高。
Superacid-Promoted synthesis of spirooxindoles
作者:Jacob C. Hood、Hien Vuong、Douglas A. Klumpp
DOI:10.1016/j.tetlet.2023.154817
日期:2023.11
provide Aldol products (3-hydroxy-3-(2-oxo-2-arylethyl)indolin-2-ones) from reaction with diethylamine and these substrates react in excess superacid to provide good yields of spirooxindoles. The resulting spirooxindoles are shown to be useful scaffolds in the syntheses of related urea, carbamate, amido, and benzylderivatives. A mechanism of cyclization is proposed involving a superelectrophilic Nazarov
C<scp>U</scp><sub>2</sub>O-Catalyzed C(<scp>SP</scp><sup>3</sup>)-H/C(<scp>SP</scp><sup>3</sup>)-H Cross-Coupling Using TEMPO: Synthesis of 3-(2-Oxoalkyl)-3-hydroxyoxindoles
作者:Baoshuang Wang、Jiayi Zhu、Yang Wei、Guotian Luo、Hongen Qu、Liang-Xian Liu
DOI:10.1080/00397911.2015.1111383
日期:2015.12.17
A simple, convenient, and efficient oxidative cross-coupling reaction of oxindoles with ketones toward a variety of 3-(2-oxoalkyl)-3-hydroxyoxindoles in moderate to excellent yields has been developed. This transformation proceeds via a tandem oxidative cross-coupling by using 2,2,6,6-tetramethylpiperidine N-oxyl (TEMPO) in air as an environmentally benign oxidant. This methodology provides an alternative approach for the direct generation of all-carbon quaternary centers at the C3 position of oxindoles.
JOSHI, K. C.;PATNI, R.;CHAND, P.;SHARMA, V.;BHATTACHARYA, S. K.;RAO, Y. V+, PHARMAZIE, 1984, 39, N 3, 153-155
作者:JOSHI, K. C.、PATNI, R.、CHAND, P.、SHARMA, V.、BHATTACHARYA, S. K.、RAO, Y. V+