Pd-Catalyzed desulfitative arylation of olefins by <i>N</i>-methoxysulfonamide
作者:Subhadra Ojha、Niranjan Panda
DOI:10.1039/d1ob02360h
日期:——
A novel Pd-catalyzed protocol for the desulfitative Heck-type reaction of N-methoxy aryl sulfonamides with alkenes was reported. The cross-coupling reaction was performed successfully with a variety of olefins to obtain aryl alkenes. Different substituents on the aromatic ring of N-methoxysulfonamides were also found to be compatible with the reaction conditions. Expectedly, the reaction proceeds through
commercially available starting materials. The activity of the palladacycle in the Mizoroki–Heck and Suzuki–Miyaura cross-coupling reactions was evaluated. The palladacycle precatalyst shows a wide substrate scope, both in Mizoroki–Heck as well as in Suzuki–Miyaura cross-coupling reactions using low catalyst loadings viz., 0.2 mol% and 0.1 mol% respectively.
作者:Zheng‐Jun Wang、Xiangyang Chen、Lei Wu、Jonathan J. Wong、Yong Liang、Yue Zhao、Kendall N. Houk、Zhuangzhi Shi
DOI:10.1002/anie.202016573
日期:2021.4.6
conspicuously underdeveloped. Here, we develop a general strategy for the site‐selective C−Hborylation of pyrroles by using only BBr3 directed by pivaloyl groups, avoiding the use of any metal. The site‐selectivity is generally dominated by chelation and electronic effects, thus forming diverse C2‐borylated pyrroles against the steric effect. The formed products can readily engage in downstream transformations
Reversal enantioselective Friedel-Crafts alkylation of pyrrole with ligands derived from the same type of chiral source of L-ramipril, by slightly tuning the amide units has been realized.