Solid-supported barbituric acid can be used for the palladium(0)-catalyzeddeprotection of allyl amines, carbamates, carbonates, esters and ethers. This solid-supported reagent facilitates isolation and purification of the deprotected compounds. especially acids and amines.
<i>N</i>-Methylimidazole-catalyzed Synthesis of Carbamates from Hydroxamic Acids via the Lossen Rearrangement
作者:Sabesan Yoganathan、Scott J. Miller
DOI:10.1021/ol303424b
日期:2013.2.1
An efficient, one-pot, N-methylimidazole (NMI) accelerated synthesis of aromatic and aliphatic carbamates via the Lossenrearrangement is reported. NMI is a catalyst for the conversion of isocyanate intermediates to the carbamates. Moreover, the utility of arylsulfonyl chloride in combination with NMI minimizes the formation of often-observed hydroxamate-isocyanate dimers during the sequence. Under