Investigation of cationic Claisen-type electrophilic rearrangements of amides
摘要:
Herein we report an extension of the electrophilic rearrangement of amides to the preparation of a, prenyl-hydrocoumarins, indoles, isoquinolines and dihydro-isoquinolinones. An unusual competitive sulfonyl migration, uncovered upon attempted aza-Claisen rearrangement, is also described. (C) 2015 Elsevier Ltd. All rights reserved.
[EN] INHIBITORS OF ANTIGEN PRESENTATION BY HLA-DR<br/>[FR] INHIBITEURS DE PRÉSENTATION D'ANTIGÈNE PAR HLA-DR
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2021198283A1
公开(公告)日:2021-10-07
Chromanone compounds, pharmaceutical compositions containing them, methods of making them, and methods of using them including methods for treating disease states, disorders, and conditions associated with the inhibition of antigen presentation by HLA-DR.
Pentanidium- and Bisguanidinium-Catalyzed Enantioselective Alkylations Using Silylamide as Brønsted Probase
作者:Bo Teng、Wenchao Chen、Shen Dong、Choon Wee Kee、Dhika Aditya Gandamana、Lili Zong、Choon-Hong Tan
DOI:10.1021/jacs.6b05053
日期:2016.8.10
asymmetric phase transfer reactions are Brønsted base reactions, and the inorganic bases used greatly influenced the profile of the reaction. Alkoxide salts are able to activate substrates with high pKa values, but background reactions are often unavoidable. On the other hand, carbonate and phosphate salts are milder, but their lowbasicity limits the scope of their reactions. This presents a difficult
α-Allylation of Carbonyl Compounds via Silyl Enol Ethers and Silyl Ketene Acetals using a Hypervalent Iodine Reagent†
作者:Robert M. Moriarty、Widanagamage R. Epa、Om Prakash
DOI:10.1039/a701224a
日期:——
allyltrimethylsilane with iodosobenzene and trimethylsilyl trifluoromethanesulfonate followed by treatment with trimethylsilyl enolethers of ketones or trimethylsilyl ketene acetals of esters/lactones provides a new method for the α-allylation of the corresponding carbonylcompounds.
A cooperative N-heterocyclic carbene/palladium catalysis system
作者:Kun Liu、M. Todd Hovey、Karl A. Scheidt
DOI:10.1039/c4sc01536c
日期:——
N-heterocycliccarbenes (NHC) have been extensively studied as organocatalysts and ligands for transition metals, but the successful integration of NHCs and late transition metals in cooperativecatalysis remains an underexplored area. We have developed a cooperative palladium-catalyzed allylation of NHC-activated aldehydes to access a variety of 3-allyl dihydrocoumarin derivatives. Kinetic experiments