23565-78-8Relevant academic research and scientific papers
Modular Dual-Tasked C-H Methylation via the Catellani Strategy
Gao, Qianwen,Shang, Yong,Song, Fuzhen,Ye, Jinxiang,Liu, Ze-Shui,Li, Lisha,Cheng, Hong-Gang,Zhou, Qianghui
, p. 15986 - 15993 (2019)
We report a dual-tasked methylation that is based on cooperative palladium/norbornene catalysis. Readily available (hetero)aryl halides (39 iodides and 4 bromides) and inexpensive MeOTs or trimethylphosphate are utilized as the substrates and methylating reagent, respectively. Six types of "ipso" terminations can modularly couple with this "ortho" C-H methylation to constitute a versatile methylation toolbox for preparing diversified methylated arenes. This toolbox features inexpensive methyl sources, excellent functional-group tolerance, simple reaction procedures, and scalability. Importantly, it can be uneventfully extended to isotope-labeled methylation by switching to the corresponding reagents CD3OTs or 13CH3OTs. Moreover, this toolbox can be applied to late-stage modification of biorelevant substrates with complete stereoretention. We believe these salient and practical features of our dual-tasked methylation toolbox will be welcomed by academic and industrial researchers.
Effects of ortho-substituent groups of sulochrin on inhibitory activity to eosinophil degranulation
Ohashi, Hiroshi,Ueno, Akihiro,Nakao, Toyoo,Ito, Junko,Kimura, Kaname,Ishikawa, Masaharu,Kawai, Hiroyuki,Iijima, Hiroshi,Osawa, Tatsushi
, p. 1945 - 1948 (2007/10/03)
Sulochrin, a metabolite of fungi, has been shown to have an inhibitory activity to eosinophil degranulation. A series of sulochrin derivatives substituted at ortho-positions to the 10-carbonyl group was examined the activity. The importance of alkylester
