5747-00-2Relevant academic research and scientific papers
Enantioselective Oxidative Rearrangements with Chiral Hypervalent Iodine Reagents
Brown, Michael,Kumar, Ravi,Rehbein, Julia,Wirth, Thomas
supporting information, p. 4030 - 4035 (2016/03/16)
A stereoselective hypervalent iodine-promoted oxidative rearrangement of 1,1-disubstituted alkenes has been developed. This practically simple protocol provides access to enantioenriched α-arylated ketones without the use of transition metals from readily
Selenium-catalyzed regioselective cyclization of unsaturated carboxylic acids using hypervalent iodine oxidants
Singh, Fateh V.,Wirth, Thomas
supporting information; experimental part, p. 6504 - 6507 (2012/02/02)
A new and convenient selenium-catalyzed regioselective cyclization of γ, δ-unsaturated carboxylic acids to the corresponding 3, 6-dihydro-2Hpyran- 2-ones is described. The cyclization products have been obtained in good to excellent yields using diphenyl diselenide as a catalyst and [bis(trifluoroacetoxy)iodo]benzene as a stoichiometric oxidant 2011 American Chemical Society.
Pyridine compounds which are useful in treating a disease state characterized by an excess of platelet activating factors
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, (2008/06/13)
The invention relates to compounds of the formula STR1 wherein Y and Y' are hydrogen or taken together are O or S, *A is paraphenylene or *----(CH2)n --(X)s --(CH2)r ----, X is O, S or --CH=CH--, n or r, independently, are integers from 0 to 3, m is an integer from 0 to 1, s is an integer from 0 to 1, provided that when s is 1, n+m must be at least 2, t is an integer from 0 to 10, R1 and R2, independently, are lower alkyl, lower alkenyl or aryl, or one of R1 or R2 is hydrogen and the other is STR2 wherein W is STR3 --CH2 --CH2 --, --CH2 --, O, S, or STR4 and X1 is lower alkyl, phenyl unsubstituted or mono-, di- or trisubstituted by lower alkoxy, lower alkyl or halogen, and X2, X3 and X4, independently, are hydrogen, lower alkyl, lower alkoxy or halogen, R3 is hydrogen, lower alkyl or aryl, R4 is hydrogen, lower alkyl, aryl, aryl-lower alkyl or acyl, R5 is hydrogen or lower alkyl, R6 is hydrogen, lower alkyl, cycloalkyl, Het-lower alkyl or aryl, Het is a monocyclic 6-membered heteroaromatic radical containing one or two nitrogen atoms, which radical may be substituted by lower alkyl, halogen or aryl, and the asterisk denotes the point of attachment, and when R5 and R6 are different, their enantiomers and racemic mixtures thereof, when R1 and R2 are different, their geometric isomers, and pharmaceutically acceptable acid addition salts thereof.
Lactones, XX. - Grignardation Followed by Phase-Transfer Oxidation: A Convenient Synthesis of δ,δ-Disubstituted δ-Lactones from δ-Valerolactone
Lehmann, Jochen,Marquardt, Norbert
, p. 827 - 832 (2007/10/02)
A Grignardation-oxidation sequence, without isolation of intermediates, easily transfers δ-valerolactone (4) into Δ,δ-disubstituted δ-lactones 6.The synthesis of δ,δ-diphenyl-δ-valerolactone (6a) served as an exsample for a detailed investigation of the r
