作者:Nadine Körber、Frank Rominger、Thomas J.â J. Müller
DOI:10.1002/adsc.200900494
日期:2009.11
easily accessible alkyl and (hetero)aryl-substituted alkynyl allyl alcohols are readily and enantioselectively transformed into 2,7-dioxabicyclo[3.2.1]octanes by a sequential rhodium-catalyzed process. Based on the initial cycloisomerization, the in situ generated rhodium(I)-BINAP complex enables a subsequentreduction with hydrogen and the transformation into bicyclic frameworks.
The first one-pot Alder-ene-reductive amination sequence
作者:Christoph J. Kressierer、Thomas J.J. Müller
DOI:10.1016/j.tetlet.2004.01.033
日期:2004.3
Alkyne allyl alcohols 1 Lire cycloisomerized Under Pd catalysis to give (4-alkylidene tetrahydrofuran-3-yl) acetaldehydes 2 in good yields. These mild reaction conditions are fully compatible with a subsequent reductive amination with secondary amines and to formic acid. Thus, the cycloisomerization-reductive amination sequence of yne allyl alcohols 1 and secondary amines 3 furnishes beta-amino ethyl alkylidene tetrahydrofurans 4 in moderate to good yields in a one-pot fashion. (C) 2001 Elsevier Ltd. All rights reserved.
Highly Enantioselective Rh-Catalyzed Intramolecular Alder–Ene Reactions for the Syntheses of Chiral Tetrahydrofurans