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
Transformations of pyridiniums derived from amino-alcohols and from diamines
作者:Alan R. Katritzky、Roland T. Langthorne、Ranjan C. Patel、Gerard Lhommet
DOI:10.1016/s0040-4020(01)88894-3
日期:1981.1
Pyridiniumsderivedfrom amino alcohols cyclise to ethers or rearrange to aldehydes on heating. Monopyridiniums from diamines can be acylated or converted into ureas or thioureas: these products cyclise on heating in solution to give dihydro-thiazoles, -4H-thiazines, -oxazoles, -4H-oxazines, or tetrahydro-3H-thiazepines.
Synthesis of Diaryl Diazaphosphonates via 1,6-Hydrophosphonylation of <i>p</i>-Quinone Methides with <i>N</i>-Heterocyclic Phosphine–Thioureas
作者:Nagaraju Molleti、Jun Yong Kang
DOI:10.1021/acs.orglett.7b00261
日期:2017.2.17
method for the synthesis of diaryl diazaphosphonates via 1,6-hydrophosphonylation/aromatization of p-quinone methides (p-QMs) with N-heterocyclic phosphine–thioureas has been developed. This transformation proceeds without any additive or catalyst under mild reaction conditions and tolerates a wide range of p-QMs. This methodology provides a straightforward access to diaryl phosphonate derivatives in
Novel thiazinephosphonic acid derivatives (I): ##STR1## wherein R.sup.1 and R.sup.2 each is lower alkoxy, lower alkynyloxy, lower alkylthio, arylthio (e.g., monocyclic aromatic group), or lower alkylamino; R.sup.3 and R.sup.4 each is hydrogen or lower alkyl; R.sup.5, R.sup.6, and R.sup.7 each is hydrogen, lower alyl, lower alkoxy, halogen, or trifluoromethyl; and X is oxygen or sulfur, are disclosed. A method for the production thereof, and pesticides comprising said compounds (I) are provided.
Selenium-Containing Heterocycles From Isoselenocyanates: Synthesis of1,3-Selenazolidine and Perhydro-1,3-selenazine Derivatives
作者:Geoffroy L. Sommen、Anthony Linden、Heinz Heimgartner
DOI:10.1002/ejoc.200500090
日期:2005.7
Treatment of ω-halo alkylamines 9 and 10 with aryl and alkyl isoselenocyanates 6a–g in the presence of triethylamine in dichloromethane gave the corresponding 1,3-selenazolidines 11a–g and perhydro-1,3-selenazines 12a–g, respectively, in good to excellent yields. Chemical and spectroscopic evidence for the structures of all new compounds are presented, and in selected examples the molecular structures