1,1-Bis(benzotriazolyl) derivatives as gem-dianion synthons
摘要:
Bis(benzotriazolyl)methylbenzenes la,b were converted by excess lithium metal in the presence of ketones into the 1,3-diols 3a-g in moderate to good yields. However, similar treatment of 5 gave only the mono reduction products 6, 7. Compounds la,b reacted with 1 equivalent of diketone 8 to form olefins 10a,b. (C) 1998 Elsevier Science Ltd. All rights reserved.
Regioselective Nickel-Catalyzed Reductive Couplings of Enones and Allenes
作者:Wei Li、Nan Chen、John Montgomery
DOI:10.1002/anie.201004740
日期:2010.11.8
Alkenes made easy: In a complement to coupling processes of terminal alkynes, the reductivecoupling of enones and allenes provides access to conjugate addition products that possess a 1,1‐disubstituted alkene (see scheme; cod=1,5‐cyclooctadiene). The solvent composition and reducing agent must be carefully matched to allow high levels of regioselectivity to be observed.
Lewis acid/CpRu dual catalysis in the enantioselective decarboxylative allylation of ketone enolates
作者:David Linder、Martina Austeri、Jérôme Lacour
DOI:10.1039/b910475e
日期:——
The addition of a Lewisacidic metal triflate salt Mg(OTf)2 as co-catalyst in the CpRu-catalyzed decarboxylative allylation of in situ-generated ketone enolates allows the reaction to proceed at lower temperature with higher regio- and enantioselectivity. Even so-far-unreactive substrates react.