Access to indoles<i>via</i>Diels-Alder reactions of 2-vinylpyrroles with maleimides
作者:Wayland E. Noland、Nicholas P. Lanzatella、Lakshmanan Venkatraman、Nicholas F. Anderson、Glen C. Gullickson
DOI:10.1002/jhet.198
日期:2009.11
Variously substituted 2‐vinylpyrroles underwent an endo‐addition [4+2] cycloaddition reaction with maleimides followed by a spontaneous highly diastereoselective (93–98% de) isomerization to give tetrahydroindoles in moderate to excellent yield. Treatment with activated MnO2 in refluxing toluene provided the corresponding indoles in moderate to good yield. This highly convergent methodology for formation
Boron Lewis Acid Catalyzed Hydrophosphorylation of N-Heteroaryl-Substituted Alkenes
作者:Sarah Yunmi Lee、Soojin Kwak、Jeongin Choi
DOI:10.1055/a-2218-9298
日期:2024.2
bearing N-heterocycles, including pyridines, a quinoline, a pyrrole, and a benzothiazole, resulting in the production of β-N-heteroaryl alkylphosphonates in good yields under additive-free, operationally simple conditions. The mechanistic insights suggest that this hydrophosphorylation involves the deprotonation of the P–H bond of dialkyl phosphites, enabled by the cooperative effects of a boron acid and
In the presence of a thiylradical species, the catalytic Markovnikov thiol–ene reaction is challenging because it prefers to proceed via a radical pathway, thereby leading to anti-Markovnikov selectivity. In this work, a rare example of thiylradical engaged in Markovnikov thiol–ene reaction enabled by cobalt catalysis is reported. This protocol features the avoidance of unique oxidants, exclusive