Diboration of 3-substituted propargylic alcohols using a bimetallic catalyst system: access to (<i>Z</i>)-allyl, vinyldiboronates
作者:Cheryl L. Peck、Jan Nekvinda、Webster L. Santos
DOI:10.1039/d0cc03563g
日期:——
A Pd/Cu catalyst system facilitates the diboration of unactivated propargylic alcohols with pentafluoroboronic acid and diboron to generate (Z)-allyl, vinyldiboronates.
Stereochemical Determination of the Leupyrrins and Total Synthesis of Leupyrrin A<sub>1</sub>
作者:Daniel Herkommer、Sebastian Thiede、Paul R. Wosniok、Sandra Dreisigacker、Maoqun Tian、Thomas Debnar、Herbert Irschik、Dirk Menche
DOI:10.1021/jacs.5b01894
日期:2015.4.1
stereochemical determination of the potent antifungal agents leupyrrin A1 and B1 and the total synthesis of leupyrrin A1 are reported. The relative and absoluteconfiguration was determined by a combination of high field NMR studies, molecular modeling, and chemical derivatization. The expedient total synthesis involves a one-pot sequential Zr-mediated oxidative diyne-cyclization/regioselective opening
Highly regioselective opening of zirconacyclopentadienes by remote coordination: concise synthesis of the furan core of the leupyrrins
作者:Thomas Debnar、Sandra Dreisigacker、Dirk Menche
DOI:10.1039/c2cc37678d
日期:——
An efficient protocol for the highly regioselective opening of aliphatic zirconacyclopentadienes is reported. The one-pot process involves a zirconocene-mediated cyclization of 1,6-diynes and highly selective cleavage of the metallacycles with NBS and enables a concisesynthesis of the tetrahydrofuran-core of the leupyrrins.