Acid-Catalyzed Reaction of (4,4-Diethoxybutyl)ureas with Phenols as a Novel Approach to the Synthesis of <font>α</font>-Arylpyrrolidines
作者:Almir S. Gazizov、Andrey V. Smolobochkin、Julia K. Voronina、Alexander R. Burilov、Michail A. Pudovik
DOI:10.1080/00397911.2015.1011340
日期:2015.5.19
intramolecular cyclization in the presence of trifluoroacetic acid and various phenols, leading to the new N-alkyl-2-arylpyrrolidine-1-carboxamides with moderate to excellent yields. It was found that these compounds undergo spontaneous solid-phase epimerization at room temperature. Advantages of the proposed approach are mild reaction conditions and no need for expensive reagents or catalysts. GRAPHICAL ABSTRACT
Solvent-Free Synthesis of Cyanoformamides from Carbamoyl Imidazoles
作者:Jeremy Nugent、Sarah G. Campbell、Yen Vo、Brett D. Schwartz
DOI:10.1002/ejoc.201700974
日期:2017.9.15
Secondary and tertiary cyanoformamides have been synthesized with a solvent-free approach from carbamoyl imidazoles and TMSCN. This method negates the need to use large excesses of toxic reagents and is amenable to large-scale synthesis.
Carbamate-bearing carbohydrates contribute to the pharmacological properties of various natural glycosides. The catalytic site-selective carbamoylation of minimally protected pyranosides was achieved for the first time to bypass protection/deprotection sequences. 1-Carbamoylimidazoles were used as the carbamoylation reagents to circumvent the harmful and unstable phosgene and isocyanates. This borinic
<i>N</i>-Alkyl Carbamoylimidazoles as Isocyanate Equivalents: Exploration of the Reaction Scope for the Synthesis of Ureas, Hydantoins, Carbamates, Thiocarbamates, and Oxazolidinones
作者:Jazmin Bansagi、Cody Wilson-Konderka、Vincent Debrauwer、Pournima Narayanan、Robert A. Batey
DOI:10.1021/acs.joc.2c00803
日期:2022.9.2
methyl ester and carbamoylimidazoles. The reaction of carbamoylimidazoles with alcohols and thiols under basic conditions affords carbamates and thiocarbamates, respectively, in good yields. Lastly, a method for the preparation of chiral oxazolidinone heterocycles from chiral epoxy alcohols is demonstrated using a double displacement approach. The reactions occur with high regio- and stereoselectivity