1,721,000 research outputs found
Synthesis via organoborates of (2E,4Z)-1-oxyfunctionalized dienes, useful intermediates of natural and bioactive compounds
No full textRegio- and stereoselective epoxidation of steroidal 1,4-diene-3-ones by dimethyldioxirane: a new access to A-norsteroids and to a class of estrogen synthetase inhibitors
No full textNew approaches to steroid hormones and vitamins via dioxiranes, reagents with biomimetic features
No full textOxidation of Uracil derivatives and pyrimidine nucleosides by dimethyldioxirane: a new and mild synthesis of 5,6-oxiranyl-5,6-dihydro and 5,6-dihydroxy-5,6-dihydro-derivatives
No full textA new and efficient synthesis of cytidine and adenosine derivatives by dimethyldioxirane oxidation of thiopyrimidine and thiopurine nucleosides
No full textDimethyldioxirane oxidation of thiopyrimidine and thiopurine
nucleosides. in the presence of amines in stoichiometric amount,
afforded selectively and under mild experimental conditions cytidine and
adenosine nucleosides
Dimethyldioxirane oxidations: a new and efficient desulfurization of thiopyrimidine and thiopurine nucleosides
No full textDimethyldioxirane reacts with 2', 3', 5'-tri-O-acetyl-4(3H)thiouridine 1
and 2-acetamido-6-thio-9-(2',3',5'-tri-O-acetyl-beta-D-ribosyl)purine 2
to afford several interesting desulfurized products
Dimethyldioxirane-Mn(C116)TDMPPCl porphyrin as efficient and chemoselective epoxidizing reagent of uracil derivatives
No full textDimethyldioxirane (DMDO) was employed as oxygen donor in metalloporphyrins catalyzed selective epoxidation of uracil derivatives. Copyright © 1996 Elsevier Science Ltd
Transformations of thiopyrimidine and thiopurine nucleosides following oxidation with dimethyldioxirane.
No full textA general and convenient method for the synthesis of several pyrimidine
and purine nucleosides by selective oxidation of thionucleosides with
dimethyldioxirane is reported. Thioketo moieties in the C-4 position of
the pyrimidine ring, and in the C-6, and C-8 positions of the purine
ring are the domain of oxidative nucleophilic substitution. Thioketo
moieties in the C-2 position of both purine and pyrimidine rings are the
domain of desulfurization or formation of disulfides. Copyright (C) 1996
Elsevier Science Lt
Regio and diastereoselective oxygen assisted opening by monochloroborane-dimethylsulfide of epoxides to anti chlorohydrins
No full textA Highly regio- and stereoselective C5 oxyfunctionalization of coprostane steroids by dioxiranes: an improved acces to progestogen and androgen hormones
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