Regio‐ and Enantioselective Preparation of Chiral Allylic Sulfones Featuring Elusive Quaternary Stereocenters
作者:Aijie Cai、Arjan W. Kleij
DOI:10.1002/anie.201908318
日期:2019.10.14
We describe here the first general asymmetric synthesis of sterically encumbered α,α-disubstituted allylic sulfones via Pd-catalyzed allylicsubstitution. The design and application of a new and highly efficient phosphoramidite ligand (L10) proved to be crucial, and a wide variety of challenging allylic sulfones featuring quaternary stereocenters could be obtained in good yields and with good to excellent
of aliphatic sulfinates. This cost-effective method involves the use of 2-mercaptobenzothiazole under mild conditions and exhibits good yields (up to 78% over three steps). This approach provides an access to a wide range of functionalized sulfinates. A good tolerance with respect to diverse functional groups (alkene, alkyne, ether, acetal) was also noted.
Direct sulfonylation of anilines mediated by visible light
作者:Tarn C. Johnson、Bryony L. Elbert、Alistair J. M. Farley、Timothy W. Gorman、Christophe Genicot、Bénédicte Lallemand、Patrick Pasau、Jakub Flasz、José L. Castro、Malcolm MacCoss、Darren J. Dixon、Robert S. Paton、Christopher J. Schofield、Martin D. Smith、Michael C. Willis
DOI:10.1039/c7sc03891g
日期:——
biologically active molecules and are key functional groups for organic synthesis. We report a mild, photoredox-catalyzed reaction for sulfonylation of aniline derivatives with sulfinate salts, and demonstrate the utility of the method by the late-stage functionalization of drugs. Key features of the method are the straightforward generation of sulfonyl radicals from bench-stable sulfinate salts and the
Late‐Stage Functionalization of Histidine in Unprotected Peptides
作者:Anaïs F. M. Noisier、Magnus J. Johansson、Laurent Knerr、Martin A. Hayes、William J. Drury、Eric Valeur、Lara R. Malins、Ranganath Gopalakrishnan
DOI:10.1002/anie.201910888
日期:2019.12.19
late-stage functionalization (LSF) of peptides represents a valuable strategy for the design of potent peptide pharmaceuticals by enabling rapid exploration of chemical diversity and offering novel opportunities for peptide conjugation. While the C(sp2 )-H activation of tryptophan (Trp) is well documented, the resurgence of radical chemistry is opening new avenues for the C-H functionalization of other
作者:Ryan Gianatassio、Shuhei Kawamura、Cecil L Eprile、Klement Foo、Jason Ge、Aaron C. Burns、Michael R. Collins、Phil S. Baran
DOI:10.1002/anie.201406622
日期:2014.9.8
A simple method to convert readily available carboxylic acids into sulfinate salts by employing an interrupted Barton decarboxylation reaction is reported. A medicinally oriented panel of ten new sulfinate reagents was created using this method, including a key trifluoromethylcyclopropanation reagent, TFCS‐Na. The reactivity of six of these salts towards CH functionalization was field‐tested using
报道了一种通过使用间断的 Barton 脱羧反应将容易获得的羧酸转化为亚磺酸盐的简单方法。使用这种方法创建了一个由十种新亚磺酸盐试剂组成的医学导向面板,其中包括一种关键的三氟甲基环丙烷化试剂 TFCS-Na。使用几种不同类别的杂环对这些盐中的六种对C H 官能化的反应性进行了现场测试。