Silica-promoted facile synthesis of thioesters and thioethers: a highly efficient, reusable and environmentally safe solid support
作者:Basudeb Basu、Susmita Paul、Ashis K. Nanda
DOI:10.1039/b925620b
日期:——
An efficient, mild and rapid procedure for the acylation and alkylation of aromatic and aliphatic thiols mediated on a silica gel surface at room temperature is described. The protocol allows the protection of thiols under neutral heterogeneous conditions without requiring any bases or Lewis acids, and the silica gel used as the promoter can be recycled for several runs without any loss of activity.
A novel general route to the synthesis of carboxylic acid esters and thiolesters
作者:K. Sucheta、G.S.R. Reddy、D. Ravi、N. Rama Rao
DOI:10.1016/s0040-4039(00)73371-5
日期:1994.6
Carboxylic acids were conveniently esterfied with alcohols and thiols by the use of triphenylphosphine and N-bromo/Iodo succinimide to afford the corresponding esters and thiol esters.
Unprecedented dithiolation of enals via their NHC-catalysed umpolung reaction with organic disulfides
作者:Santosh Singh、Lal Dhar S. Yadav
DOI:10.1039/c2ob25238d
日期:——
A novel one-pot N-heterocyclic carbene (NHC)-catalysed dithiolation of α,β-unsaturated aldehydes (enals) with organic disulfides is reported. The protocol involves homoenolate reactivity of enals, where the homoenolate attacks on the disulfide as a d3 nucleophile followed by thioesterification to afford β-aryl/alkylsulfanyl thioesters with complete atom economy.
The direct thioesterification of aldehydes with disulfides via NHC-catalyzed carbonyl umpolung strategy
作者:Santosh Singh、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2012.07.042
日期:2012.9
(enals) with diaryldisulfides is reported. The protocol involves carbonyl umpolung reactivity of aldehydes and enals in which the carbonyl carbon attacks nucleophilically on diaryldisulfides to afford thioesters and α,β-unsaturated thioesters, respectively. However, aliphatic aldehydes are not suitable substrates for this reaction. No by-product formation, complete atom-economy, shorter reaction time, ambient
A catalytic method was developed to synthesize thiolesters from the reaction of acyl chlorides and thiols using zinc oxide as a catalyst under solvent-free conditions at room temperature. Mild reaction conditions, short reaction time, excellent yields of products and recyclability of the catalyst are noteworthy features of this methodology.