<i>N</i>,<i>N</i>-Dimethylformamide as Hydride Source in Nickel-Catalyzed Asymmetric Hydrogenation of α,β-Unsaturated Esters
作者:Siyu Guo、Jianrong (Steve) Zhou
DOI:10.1021/acs.orglett.6b02662
日期:2016.10.21
Asymmetric transfer hydrogenation of α,β-unsaturatedesters is realized by using a nickel/bisphosphine catalyst and N,N-dimethylformamide (DMF) as the hydride source.
Superacid mediated intramolecular condensation: facile synthesis of indenones and indanones
作者:Bokka Venkat Ramulu、Gedu Satyanarayana
DOI:10.1039/c5ra12234a
日期:——
sequential method for the synthesis of indanones is advantageous, as it limits even more electron rich external arenes only to the Friedel–Crafts alkylation. This is not possible in previous reports wherein both cinnamic acid ester and the external arenes are treated together in the presence of an acid, wherein the relatively more reactive arene is preferred to facilitate the acylationstep.
environmentally benign [Cu(I)]-catalyzed oxidation of activated (benzylic/allylic) alcohols to the corresponding carbonyl compounds is presented. Interestingly, the reaction was also compatible with benzylic alcohols containing ortho-bromo substituents on the aromatic ring without competing with the expected intermolecular Buchwald coupling. Significantly, the catalytic system enables the synthesis of cinnamate-esters
Base-catalysed reductive relay hydroboration of allylic alcohols with pinacolborane to form alkylboronic esters
作者:Zi-Chao Wang、Di Shen、Jian Gao、Xian Jia、Youjun Xu、Shi-Liang Shi
DOI:10.1039/c9cc03459e
日期:——
An unprecedented base-catalysed reductive relay hydroboration of allylicalcohols is described. Commercially available nBuLi was found to be a robust transition metal-free initiator for this protocol, affording various boronic esters in high yield and selectivity. Mechanistically, this methodology involves a one-pot three-step successive process (dehydrocoupling/allylic hydride substitution/anti-Markovnikov