The 3,3,6,6-Tetramethylcis-transoid-cis-Photocyclodimer oftert-Butyl 2,5-Dihydro-5,5-dimethyl-2-oxo-1H-pyrrole-1-carboxylate
摘要:
The X-ray structure of di-tert-butyl cis-transoid-cis-perhydro-3, 3,6,6-tetramethyl-1,4-dioxocyclobuta[1,2-c:4-c']dipyrrole-2,5-dicarboxylate, C22H33N2O6, which is the major photocyclodimer obtained on hexadeuterioacetone-sensitized irradiation of the monomeric tert-butyl 2,5-dihydro-5,5-dimethyl-2-oxo-1H-pyrrole-1-carboxylate, was determined in order to establish its constitution and configuration unambiguously.
Base-catalyzed reaction between isatins and N-Boc-3-pyrrolin-2-one
作者:Naresh Ramireddy、John C.-G. Zhao
DOI:10.1016/j.tetlet.2013.11.118
日期:2014.1
The base-catalyzed reactionbetweenisatins and N-Boc-3-pyrrolin-2-one yields Morita–Baylis–Hillman (MBH) adducts instead of the expected aldol products in good to high yields (up to 97%). Various organic and inorganic bases are efficient catalysts for this reaction. Our study excluded the Morita–Baylis–Hillman mechanism for the formation of the MBH-type products. The MBH products are most likely formed
Furan-, Pyrrole-, and Thiophene-Based Siloxydienes for Syntheses of Densely Functionalized Homochiral Compounds
作者:Giovanni Casiraghi、Gloria Rassu
DOI:10.1055/s-1995-3983
日期:1995.6
This review describes the methods of preparation and use of 2-(trimethylsiloxy)furan, N-(tert-butoxycarbonyl)-2-(tert-butyldimethylsiloxy)pyrrole, and certain substituted analogues and congeners, including novel 2-(tert-butyldimethylsiloxy)thiophene, to synthesize complex carbohydrates, azasugars, polyhydroxylated alkaloids, C-glycosylated α-amino acids, amino acids bearing quaternary chiral carbon atoms, and thiosugars. Especially emphasized is the preparation of enantiomerically pure compounds of biological interest. Some mechanistic insights are presented.