cascade reaction of azides with isonitrile and amines is presented; it offers an alternative facile approach toward N-sulfonyl-, N-phosphoryl-, and N-acyl-functionalized guanidines in excellent yield. These series of substituted guanidines exhibit potential biological and pharmacological activities. In addition, the less reactive intermediate benzoyl carbodiimide could be isolated by silica gel column flash
Ru
<sup>V</sup>
‐Acylimido Intermediate in [Ru
<sup>IV</sup>
(Por)Cl
<sub>2</sub>
]‐Catalyzed C–N Bond Formation: Spectroscopic Characterization, Reactivity, and Catalytic Reactions
作者:Dan‐Yan Hong、Yungen Liu、Liangliang Wu、Vanessa Kar‐Yan Lo、Patrick H. Toy、Siu‐Man Law、Jie‐Sheng Huang、Chi‐Ming Che
DOI:10.1002/anie.202100668
日期:2021.8.16
bond formationreactions via acylnitrene transfer have recently attracted much attention, but direct detection of the proposed acylnitrenoid/acylimido M(NCOR) (R=aryl or alkyl) species in these reactions poses a formidable challenge. Herein, we report on Ru(NCOR) intermediates in C−N bond formation catalyzed by [RuIV(Por)Cl2]/N3COR, a catalytic method applicable to aziridine/oxazoline formation from
Direct, facile synthesis of acyl azides and nitriles from carboxylic acids using bis(2-methoxyethyl)aminosulfur trifluoride
作者:Cyrous O. Kangani、Billy W. Day、David E. Kelley
DOI:10.1016/j.tetlet.2007.06.119
日期:2007.8
A mild, efficient, and practical method for the one-step synthesis of acyl azides from carboxylic acids using bis(2-methoxyethyl)aminosulfur trifluoride is described. The reaction was easily extended to the synthesis of the corresponding nitriles by the inclusion of phosphorous reagents. The method can be applied to the synthesis of optically active nitriles in high yields, and is compatible with fluorous
developed methodology rendered the use of carboxylic acids as a direct surrogate of primary amines, for the synthesis of primary ureas, secondary/tertiaryureas, O/S-carbamates, benzoyl ureas, amides, and N-formyls, exploiting the Curtius reaction. This approach has a potential to provide a diversified library of N-containing compounds, starting from a single carboxylic acid, based on the selection of the
Visible light sensitization of benzoyl azides: cascade cyclization toward oxindoles via a non-nitrene pathway
作者:Dattatraya B. Bagal、Sung-Woo Park、Hyun-Ji Song、Sukbok Chang
DOI:10.1039/c7cc04852a
日期:——
Visible light sensitization of benzoylazides was examined in reaction with N-phenylmethacrylamides to afford biologically important oxindoles and spirooxindoles via a cascade cyclization under mild reaction conditions. Mechansitic studies suggested a non-nitrene pathway, where triplet benzoylazides act as the reactive intermediate.