ortho-Formylation of oxygenated phenols
نویسندگان
چکیده
منابع مشابه
Palladium-catalysed ortho-arylation of carbamate-protected phenols.
The carbamate (-O2CNR2) function is an excellent directing group for palladium-catalysed direct arylation reactions giving both protected or free mono- or di-substituted phenols, as well as an example of a dibenzopyranone, depending on coupling partners (aryl iodides or diaryliodonium salts) and conditions.
متن کاملSelective formylation of alcohols in the presence of phenols with chloral
Primary and secondary alcohols were formylated selectively in the presence of phenols by stirring with chloral in acetone over anhydrous K2CO3 at ambient temperatures in high yields. O-Formylation could be the method of choice for protecting an alcoholic group in a complex synthetic sequence because deformylation can be effected selectively in the presence of acetate or other ester protecting g...
متن کاملFormylation of amines.
Methods to convert amines to formamides are of interest due to the many uses of formamides as synthetic intermediates. These methods include stoichiometric reactions of formylating reagents and catalytic reactions with CO as the carbonyl source. This review discusses the reported stoichiometric and catalytic approaches for preparation of formamides.
متن کاملOne-pot Multi-step Synthesis of some Aromatic Salicylaldoximes Using MgO Nanoparticles
MgO nanopartticels (NP-MgO) in average size between 30—130 nm were prepared by sonochemistry method. Some phenols have been converted to ortho-hydroxybezaldehyd by ortho-formylation using MgO nanoparticles and (CH2O)n in xylene and subsequently treated with aqueous NH2OH.HCl, affording the corresponding aldoxime in a one-pot procedure. Moreover, this one-pot process, with two transformations, o...
متن کاملEnantiospecific sp2–sp3 Coupling of ortho‐ and para‐Phenols with Secondary and Tertiary Boronic Esters
The coupling of ortho- and para-phenols with secondary and tertiary boronic esters has been explored. In the case of para-substituted phenols, after reaction of a dilithio phenolate species with a boronic ester, treatment with Ph3 BiF2 or Martin's sulfurane gave the coupled product with complete enantiospecificity. The methodology was applied to the synthesis of the broad spectrum antibacterial...
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ژورنال
عنوان ژورنال: Tetrahedron Letters
سال: 2009
ISSN: 0040-4039
DOI: 10.1016/j.tetlet.2009.08.101