Asymmetric Cascade Reaction to Allylic Sulfonamides from Allylic Alcohols by Palladium(II)/Base-Catalyzed Rearrangement of Allylic Carbamates
作者:Johannes Moritz Bauer、Wolfgang Frey、René Peters
DOI:10.1002/anie.201403090
日期:2014.7.14
accessible achiral allylic alcohols into chiral sulfonyl‐protected allylic amines. The reaction is catalyzed by the cooperative action of a chiral ferrocene palladacycle and a tertiary amine base and combines high step‐economy with operational simplicity (e.g. no need for inert‐gas atmosphere or catalyst activation). Mechanistic studies support a PdII‐catalyzed [3,3] rearrangement of allylic carbamates—generated
Synthesis of <scp>l</scp>-<i>altro</i>-1-Deoxynojirimycin, <scp>d</scp>-<i>allo-</i>1-Deoxynojirimycin, and <scp>d</scp>-<i>galacto-</i>1-Deoxynojirimycin from a Single Chiral Cyanohydrin
作者:Adrianus M. C. H. van den Nieuwendijk、Mark Ruben、Sander E. Engelsma、Martijn D. P. Risseeuw、Richard J. B. H. N. van den Berg、Rolf G. Boot、Johannes M. Aerts、Johannes Brussee、Gijs A. van der Marel、Herman S. Overkleeft
DOI:10.1021/ol101556k
日期:2010.9.3
The chemoenzymatic synthesis of three 1-deoxynojirimycin-type iminosugars is reported. Key steps in the synthetic scheme include a Dibal reduction−transimination−sodium borohydride reduction cascade of reactions on an enantiomerically pure cyanohydrin, itself prepared employing almond hydroxynitrile lyase (paHNL) as the common precursor. Ensuing ring-closing metathesis and Upjohn dihydroxylation afford