A New Synthesis of Alkyl Oximinoglyoxylates and the Corresponding Acid and Hydroximoyl Chlorides
作者:Terence Rave、David Breslow
DOI:10.1021/jo00823a605
日期:1971.12
Synthesis of functionalized polyhedral oligomeric silsesquioxane (POSS) macromers by microwave assisted 1,3-dipolar cycloaddition
作者:Maria A. Chiacchio、Luisa Borrello、Giovanna Di Pasquale、Antonino Pollicino、Francesco A. Bottino、Antonio Rescifina
DOI:10.1016/j.tet.2005.06.006
日期:2005.8
In this paper we report the first synthesis of isoxazolidine and isoxazoline-POSS macromers by 1,3-dipolar cycloaddition reactions of vinyl- and styryl-POSS with N-methyl-C-ethoxycarbonylnitrone and ethoxycarbonyl nitrile oxide, promoted by microwave irradiation. The nature of the resulting cycloadducts has been determined by NOE experiments and supported by computational studies at PM3 and DFT B3LYP/6-31G* levels. (c) 2005 Elsevier Ltd. All rights reserved.
The present disclosure relates to novel compounds and pharmaceutical compositions thereof which are useful as inhibitors of proteasomes. The compounds provided herein are capable of inhibiting all three of CT-L, T-L, and PGPH activities of proteasomes, and are useful in treating various conditions or diseases associated with proteasomes.
The cycloaddition of azomethine ylide N‐oxides (nitrone ylides) with aldehydes provides 3‐oxazolines in a completely stereoselective manner in the presence of a catalytic amount of n‐butyllithium. The process involves an initial nucleophilic attack on the aldehyde, followed by intramolecular oxygen addition to the nitrone moiety and lithium‐assisted elimination of water, regenerating the catalytic