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.
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.