N-Bromosuccinimide promoted and base switchable one pot synthesis of α-imido and α-amino ketones from styrenes
作者:Mahesh H. Shinde、Umesh A. Kshirsagar
DOI:10.1039/c5ob02034d
日期:——
N-Bromosuccinimide (NBS) promoted one pot strategy for the synthesis of α-amino functionalized aryl ketones starting from commercially available styrenes has been developed. NBS participates in multiple tasks, such as bromonium ion formation, oxidation of bromohydrin and providing a nucleophilic nitrogen source. The reaction can easily be switched between α-imido and α-amino ketones by the choice of base
transition-metal-free direct α-C–H amination of ketones has been developed using commercially available ammonium iodide as the catalyst and sodium percarbonate as the co-oxidant. A wide range of ketone ((hetero)aromatic or nonaromatic ketones) and amine (primary/secondary amines, anilines, or amides) substrates undergo cross-coupling to generate synthetically useful α-amino ketones. The mechanistic studies indicated
the first time to synthesize pharmaceutically important α-aminoketonesfrom readily available benzylic secondary alcohols and amines using N-bromosuccinimide. This new reaction proceeds via three consecutive steps involving oxidation of alcohols, α-bromination of ketones, and nucleophilic substitution of α-bromo ketones to give α-aminoketones. Importantly, this novel one-pot greener reaction avoids
peroxide (DTBP)-promoted α-alkylation of α-amino carbonyl compounds by simple alkanes is developed, proceedingthrough dual sp3 C–H bonds cleavage. The reaction was applicable for α-amino ketones and α-amino esters, providing a facile pathway for the α-functionalization of these substrates. The radical pathway is involved in this transformation.
Copper-Promoted Synthesis of 2-Fulleropyrrolines via Heteroannulation of [60]Fullerene with α-Amino Ketones
作者:Sheng-Peng Jiang、Qing-Hua Wu、Guan-Wu Wang
DOI:10.1021/acs.joc.7b01237
日期:2017.10.20
A Cu(OAc)2-promoted heteroannulation of [60]fullerene with α-amino ketones has been exploited for the efficient synthesis of 2-fulleropyrrolines containing a trisubstituted or tetrasubstituted C═C bond via the formation of C–C and C–N bonds. Mechanistic study indicates that a radical process should be involved in this transformation. Furthermore, theoretical computations show that the process via the