A Simple and Efficient Heterogeneous Procedure for Thioacetalization of Aldehydes and Ketones
作者:Mohammed Hashmat Ali、Maria Goretti Gomes
DOI:10.1055/s-2005-865303
日期:——
A new procedure for the protection of aldehydes and ketones as thioacetals promoted by catalytic amount of p-toluene-sulfonic acid and silica gel has been developed. This procedure offers versatility, short reaction time,excellent yield, good selectivity, and flexibility in terms of choice of solvent that can be utilized in this reaction. The procedure is easy to carry out and does not require aqueous
Poly(N-bromobenzene-1,3-disulfonamide) and N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide as a mild and efficient catalyst for chemoselective thioacetalization of carbonyl functions and transthioacetalization reactions
Poly(N‐bromobenzene‐1,3‐disulfonamide) and N,N,N′,N′‐tetrabromobenzene‐1,3‐disulfonamide are effective catalysts for chemoselective dithioacetalization of aldehydes in the presence of ketones under neutral conditions. J. Heterocyclic Chem., (2011).
The reaction of various phenols with 2-ethoxy-1,3-dithiolane proceeded smoothly in the presence of BF3·Et2O to afford 1,3-dithiolan-2-ylated phenols, which were readily hydrolyzed to the corresponding aldehydes. This process was also extended to N,N-dimethylaniline and indole.
Chemoselective thioacetalisation and transthioacetalisation of carbonyl compounds catalysed by tetrabutylammonium tribromide (TBATB)Dedicated to Professor Subramanian Ranganathan on the occasion of his 70th birthday.
作者:Sarala Naik、Rangam Gopinath、Mousumi Goswami、Bhisma K. Patel
DOI:10.1039/b402648a
日期:——
Thioacetals and thioketals of various aldehydes and ketones were obtained directly from carbonylcompounds or by a transthioacetalisation process from cyclic O,O-acetals in the presence of dithiols and a catalytic amount of tetrabutylammonium tribromide (TBATB). Chemoselective thioacetalisation of aromatic aldehydes containing an electron-donating group in the presence of an aldehyde containing an
AN EFFICIENT METHOD FOR THE THIOACETALIZATION OF CARBONYL COMPOUNDS IN THE PRESENCE OF CATALYTIC AMOUNTS OF BENZYLTRIPHENYLPHOSPHONIUM TRIBROMIDE
作者:A. R. Hajipour、S. A. Pourmousavi、A. E. Ruoho
DOI:10.1080/00304940709458596
日期:2007.8
in multi-step syntheses. Among carbonyl protecting groups, dithioacetals constitute an important class of compounds as acyl anion equivalents' or masked methylene functions in carbon-carbon bond forming reactions. They are versatile2 due to their straightforward preparation and also to their stability under basic or mildly acidicconditions. Although several methods have been reported for protection