Catalyst-free synthesis of α<sup>1</sup>-oxindole-α-hydroxyphosphonates via phospha-aldol reaction of isatins employing N-heterocyclic phosphine (NHP)-thiourea
作者:Nagaraju Molleti、Jun Yong Kang
DOI:10.1039/c6ob01608a
日期:——
A highly efficient phospha-aldol reaction for the synthesis of α1-oxindole-α-hydroxyphosphonates is developed utilizing N-heterocyclic phosphine (NHP)-thiourea as a phosphonylation reagent under catalyst, additive free conditions. This methodology encompasses a variety of isatin derivatives to provide α1-oxindole- α-hydroxyphosphonates up to 99% yield.
Amine-Catalyzed Phospha-Michael Reaction of α,β-Unsaturated Aldehydes and Ketones with Multifunctional <i>N</i>-Heterocyclic Phosphine-Thioureas as Phosphonylation Reagent
作者:Hai Huang、Jun Yong Kang
DOI:10.1021/acs.orglett.6b02121
日期:2016.9.2
amine-catalyzed phospha-Michael addition reaction of α,β-unsaturatedaldehydes/ketones with N-heterocyclic phosphines for the synthesis of γ-ketodiazaphosphonates has been developed. With freedom from nucleophile additives, this mild process affords a range of structurally diverse γ-ketodiazaphosphonates in moderate to excellent yields. Importantly, various α,β-unsaturated ketones were also tolerated in this
dehydrogenative C-N coupling between aryl C-H and N-H bonds using a hypervalentiodine reagent under mild conditions offers a versatile and convenient method for synthesizing various benzimidazole-fused heterocycles. hypervalentiodine reagent - C-N bond forming cyclization - benzimidazole-fused heterocycles - straightforward synthesis - mild conditions
A Bench-Stable Vilsmeier Reagent for in situ Alcohol Activation: Synthetic Application in the Synthesis of 2-Amino-2-Thiazolines
作者:Michael Corbett、Seb Caille
DOI:10.1055/s-0036-1589086
日期:2017.12
A robust, chemoselective direct condensation/cyclization of thioureas and amino alcohols is described. Employing a bench-stable Vilsmeier reagent, methoxymethylene- N , N -dimethyliminium methyl sulfate, the selective in situ activation of alcohols is achieved with high efficiency and broad functional-group tolerance. The reversible interaction of the Vilsmeier reagent with substrate was key to the
Recherches sur la formation et la transformation des esters LXIV. Acides aminoalcoylsulfuriques et isothiocyanates: N-thiocarbamylation sans ou avec alcoylation cyclisante intramoléculaire
Aminoalkyl sulfuric monoesters with primary or secondary amino groups – with the exception of colaminesulfuric monoester – react with isothiocyanates in the presence of one equivalent of a base to yield the corresponding hydrosoluble salts of [N-aryl(aralkyl or alkyl)thiocarbamoyl]-aminoalkyl sulfates.