cross-coupling reaction between α-amino carbonylcompounds and azoles by copper catalysis using di-tert-butyl peroxide (DTBP) as an oxidant is described. A diverse range of azoles undergo the dehydrogenative imidoylation smoothly with various α-amino carbonylcompounds for the exclusive formation of the corresponding N-imidoyl azoles in high yields under air. The synthetic method has the advantages of good
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.
Four-component strategy for selective synthesis of azepino[5,4,3-cd]indoles and pyrazolo[3,4-b]pyridines
作者:Bo Jiang、Qin Ye、Wei Fan、Shu-Liang Wang、Shu-Jiang Tu、Guigen Li
DOI:10.1039/c4cc00740a
日期:——
A novel four-component strategy for the selectivesynthesis of fused azepino[5,4,3-cd]indoles and pyrazolo [3,4-b]pyridines has been established. The bond-forming efficiency, accessibility of starting materials and substrate scope provide invaluable access to tetra-, and bis-heterocyclic scaffolds.
ABSTRACT An efficient protocol for the Lewis acid catalyzed three-component aza-Diels-Alder reaction of pentafulvenes as dienophile has been developed. Cyclopentene fused tetrahydroquinolines were formed in good yields with excellent diastereoselectivities. The method was extended to spiro[2,4]hepta-4,6-diene, by which 3,4-dihydroquinoline derivatives were obtained. The aromatization of cycloadducts
Reductive Alkylation of α-Keto Imines Catalyzed by PTSA/FeCl<sub>3</sub>: Synthesis of Indoles and 2,3′-Biindoles
作者:P. Seetham Naidu、Sinki Kolita、Meenakshi Sharma、Pulak J. Bhuyan
DOI:10.1021/acs.joc.5b00533
日期:2015.6.19
was developed. In the reaction protocol, three components were used in one pot and products were obtained in high yield in an easy workup procedure. The reaction occurred via initial reductivealkylation of α-keto imines, followed by a cyclization process in the presence of PTSA/FeCl3 as catalyst.