Treatment of benzothiazine 24 with excess amounts of n-BuLi followed by trapping with selected electrophiles afforded products that suggested the formation of dilithio species. Interestingly, however, the scope of the electrophilic trapping was rather limited, electrophilic sources of halogens and disulfides functioning nearly uniquely and competent electrophilic trapping agents in the process.
MATERIALS FOR ORGANIC ELECTROLUMINESCENT DEVICES
申请人:Merck Patent GmbH
公开号:US20220416172A1
公开(公告)日:2022-12-29
The present invention relates to an organic electroluminescent device comprising a benzothiazine derivative and it also relates to specific benzothiazine derivatives.
Further Studies of Benzothiazine Metalation
作者:Michael Harmata、Nathan Calkins
DOI:10.1055/s-0033-1338444
日期:——
with butyllithium resulted in deprotonation at C3 to afford the corresponding organolithium species. These compounds could be trapped with a variety of electrophiles to give products in high yield. Some limitations to the processes chiefly based on steric effects were uncovered. Interesting and potentially useful side reactions were also established. Treatment of benzothiazines 3 and 8 with butyllithium
Efficient palladium-catalyzed N-arylation of a sulfoximine with aryl chlorides
作者:Nattawut Yongpruksa、Nathan L. Calkins、Michael Harmata
DOI:10.1039/c1cc12444g
日期:——
The efficient N-arylation of a sulfoximine with aryl chlorides was developed by using Pd2(dba)3 as a catalyst and various ligands. The reactions using RuPhos as a ligand afforded the coupled products in fair to excellent yields.