One-pot multiple reactions: asymmetric synthesis of 2,6-cis-disubstituted piperidine alkaloids from chiral aziridine
作者:Nagendra Nath Yadav、Jihye Choi、Hyun-Joon Ha
DOI:10.1039/c6ob00806b
日期:——
A divergent, new, and highly stereoselective synthesis of cis-2,6-disubstituted piperidine natural products including isosolenopsins, deoxocassine, and spectaline was achieved from chiral aziridine decorated with appropriate alkyl chains for isosolenopsins or alkynyl groups for deoxocassine and spectaline at C2. The characteristic feature of this synthesis is one-pot sequential reactions under atmospheric
作者:Richard A. Bartsch、Leah P. Bitalac、Charles L. Cowey、Sadik Elshani、Mi-Ja Goo、Vincent J. Huber、Sheryl N. Ivy、Youngchan Jang、Russell J. Johnson、Jong Seung Kim、Elzbieta Luboch、Joseph A. Mcdonough、Michael J. Pugia、Byungki Son、Qiang Zhao
DOI:10.1002/jhet.5570370554
日期:2000.9
Synthetic routes to forty-four dibenzocrown ether alcohols are reported. The new crown ether com pounds are based on a sym-dibenzo-16-crown-5 platform. Most have a hydroxy group and an alkyl, aryl, aralkyl, alkenyl, alkynyl, or perfluoroalkyl group on the central carbon of the three-carbon bridge. Others have substituted benzene rings and either a hydroxy or -O(CH2)nOH group attached to the central
Rhodium‐Catalyzed Cyclization of Terminal and Internal Allenols: An Atom Economic and Highly Stereoselective Access Towards Tetrahydropyrans
作者:Johannes P. Schmidt、Bernhard Breit
DOI:10.1002/ange.202009166
日期:2020.12.21
AbstractA comprehensive study of a diastereoselective Rh‐catalyzedcyclization of terminal and internalallenols is reported. The methodology allows the atomeconomic and highly syn‐selective access to synthetically important 2,4‐disubstituted and 2,4,6‐trisubstituted tetrahydropyrans (THP). Furthermore, its utility and versatility are demonstrated by a great functional‐group compatibility and the
Stereospecific Asymmetric Synthesis of Tertiary Allylic Alcohol Derivatives by Catalytic [2,3]‐Meisenheimer Rearrangements
作者:Xin Yu、Nick Wannenmacher、René Peters
DOI:10.1002/anie.202001725
日期:2020.6.26
Chiral acyclic tertiary allylicalcohols are very important synthetic building blocks, but their enantioselective synthesis is often challenging. A major limitation in catalytic asymmetric 1,2‐addition approaches to ketones is the enantioface differentiation by steric distinction of both ketone residues. Herein we report the development of a catalytic asymmetric Meisenheimer rearrangement to overcome