Reductive coupling of benzyl oxalates with highly functionalized alkyl bromides by nickel catalysis
作者:Xiao-Biao Yan、Chun-Ling Li、Wen-Jie Jin、Peng Guo、Xing-Zhong Shu
DOI:10.1039/c8sc00609a
日期:——
Coupling reactions involving non-sulfonated C–O electrophiles provide a promising method for forming C–C bonds, but the incorporation of functionalized or secondary alkyl groups remains a challenge due to the requirement for well-defined alkylmetal species. In this study, we report a reductive nickel-catalyzed cross-coupling of benzyl oxalates with alkyl bromides, using oxalate as a new leaving group
11–21-membered intramolecular macrocyclic sulfonium ylides using catalytic Rh2(OAc)4 is presented. Using this approach, a wide variety of sulfur-macrocycles incorporating the oxindole unit were produced in good yields and with high diastereoselectivity. Interestingly, tetracyclic macrocycles were also attained in good yields and with good regioselectivity using the disclosed sulfonium ylides. Ring-opening
Iridium-Catalyzed C–H Amination/Cyclization for Medium to Large <i>N</i>-Heterocycle-Fused Dihydroquinazolinones
作者:Tao Zhang、Xunqing Dong、Hitesh B. Jalani、Jiaqi Zou、Guigen Li、Hongjian Lu
DOI:10.1021/acs.orglett.9b01167
日期:2019.5.17
A practical iridium-catalyzed cascade/stepwise synthesis of dihydroquinazolinones (DHQs) and bis-DHQs fused to medium to large N-heterocyclic rings is developed. The reaction undergoes benzamide-directed intermolecular C–H amination with an aldehyde-tethered alkyl azide, and then the newly installed amino group undergoes intramolecular cyclization with a remote aldehyde group present in azide and amidyl
Bisimidazole-functionalized cobaltoporphyrin acted as efficient bifunctional catalysts to facilitate the synthesis of cyclic carbonates from epoxides and CO2.
Ni-catalysed reductive arylalkylation of unactivated alkenes
作者:Youxiang Jin、Chuan Wang
DOI:10.1039/c8sc04279a
日期:——
Ni-catalyzed reductive two-component arylalkylation of unactivated olefins has been accomplished providing a path for a variety of benzene-fused carbo- and heterocyclic compounds.