Palladium-Catalyzed C(<i>sp</i><sup>3</sup>)–C(<i>sp</i><sup>2</sup>) Cross-Coupling of (Trimethylsilyl)methyllithium with (Hetero)Aryl Halides
作者:Dorus Heijnen、Valentín Hornillos、Brian P. Corbet、Massimo Giannerini、Ben L. Feringa
DOI:10.1021/acs.orglett.5b00905
日期:2015.5.1
The palladium-catalyzed direct cross-coupling of a range of organic chlorides and bromides with the bifunctional C(sp3)-(trimethylsilyl)methyllithium reagent is reported. The use of Pd-PEPPSI-IPent as the catalyst allows for the preparation of structurally diverse and synthetically versatile benzyl- and allylsilanes in high yields under mild conditions (room temperature) with short reaction times.
<i>para</i>
-Selective Benzylation of Aryl Iodides by the in situ Preparation of ArIF<sub>2</sub>
: a Hypervalent Iodine-Guided Electrophilic Substitution
作者:Jennifer Noorollah、Haram Im、Fatima Siddiqi、Nirvanie Singh、Nicholas R. Spatola、Azka Chaudhry、Taro J. Jones、I. F. Dempsey Hyatt
DOI:10.1002/ejoc.202000393
日期:2020.4.23
Hypervalent iodine‐guided electrophilic substitution (HIGES) was described previously for the para‐selective benzylation of aryl‐λ3‐iodane diacetates. To make our methodology more accessible to the synthetic community, a procedure was developed in which the benzylationproduct can be afforded from an aryl iodide by an in situ oxidation with an overall higher yield for most substrates.
Ir-Catalyzed Asymmetric and Regioselective Hydrogenation of Cyclic Allylsilanes and Generation of Quaternary Stereocenters via the Hosomi-Sakurai Allylation
作者:Wangchuk Rabten、Cristiana Margarita、Lars Eriksson、Pher G. Andersson
DOI:10.1002/chem.201704684
日期:2018.2.1
containing the allylsilane moiety were prepared by a Birchreduction and subjected to iridium‐catalyzed regioselective and asymmetric hydrogenation, which provided chiral allylsilanes in high conversion and enantiomeric excess (up to 99 % ee). The compounds were successively used in the Hosomi–Sakurai allylation with various aldehydes employing TiCl4 as Lewis acid, providing adducts with two additional stereogenic