(Tosylimino)phenyl-λ<sup>3</sup>-iodane as a Reagent for the Synthesis of Methyl Carbamates via Hofmann Rearrangement of Aromatic and Aliphatic Carboxamides
作者:Akira Yoshimura、Matthew W. Luedtke、Viktor V. Zhdankin
DOI:10.1021/jo300007c
日期:2012.2.17
A new, mild procedure for the Hofmann rearrangement of aromatic and aliphatic carboxamides using (tosylimino)phenyl-λ3-iodane, PhINTs, as a reagent is reported. Because of the mild reaction conditions, this method is particularly useful for the Hofmann rearrangement of substituted benzamides, which usually afford complex reaction mixtures with other hypervalent iodine oxidants. The mild reaction conditions
A facile one-pot, phosgene-free method for the synthesis of N-phenylcarbamates is developed. Using this method, various aromatic carbamates could be prepared from aromatic amines, CO2 and metal alk...
One-pot synthesis of N-substituted (3-oxobutanyl)carbamates from primary amines using modified zeolite Hβ at room temperature
作者:Vivek P. Raje、Ramakrishna P. Bhat、Shriniwas D. Samant
DOI:10.1016/j.tetlet.2004.11.156
日期:2005.1
The one-pot synthesis of N-substituted (3-oxobutanyl)carbamates via the tandem condensation of primaryamines with methyl chloroformate, followed by the conjugate addition of the resulting carbamate with methyl vinyl ketone in the presence of Sn4+ modified zeolite Hβ (Hβ-SnA) at room temperature is described.
Aniline Carbamates: A Versatile and Removable Motif for Palladium-Catalyzed Directed CH Activation
作者:Nick Uhlig、Chao-Jun Li
DOI:10.1002/chem.201403712
日期:2014.9.15
ability as a directing group are demonstrated by its use in the ortho‐arylation of a wide variety of aniline derivatives under palladium(II) catalysis, with symmetric diaryliodonium salts as aryl donors. The reaction differs from previously reported arylations in its selectivity and its mechanism, as elucidated by kinetic and isotopic experiments. The directing group can also be easily removed under a
An electrochemical Hofmann rearrangement is reported. With the mediation of NaBr, highly corrosive and toxic halogens are avoided. Moreover, this efficient and green approach is well compatible with a broad range of amides, including several commercial medicine derivatives, and provides direct access to synthetically useful carbamates. The synthetic utility of this method is also demonstrated by the