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Heidelberg, Germany

Albrecht M.,RWTH Aachen | Isaak E.,RWTH Aachen | Baumert M.,RWTH Aachen | Gossen V.,RWTH Aachen | And 2 more authors.
Angewandte Chemie - International Edition | Year: 2011

Undecided! A titanium(IV) triscatecholate bearing chiral ester groups shows different CD spectra in methanol and DMSO. The observation of different stereoisomers lies in the preferred conformation of the side groups in the monomer and dimer, which leads to different chiral induction in the different species. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Gierz V.,University of Tubingen | Seyboldt A.,University of Tubingen | Maichle-Mossmer C.,University of Tubingen | Frohlich R.,Organisch Chemisches Institute | And 2 more authors.
European Journal of Inorganic Chemistry | Year: 2012

A straightforward synthesis method for mixed phosphane dipyrido-annelated N-heterocyclic carbene (dipiy) palladium(II) complexes is presented. The key step is the oxidative addition of 6-bromodipyridoimidazolium bromides that can be prepared easily from dipyridine in a two step reaction. This new procedure avoids any generation of the free carbene as well as any transmetallation step. The straightforward synthesis of mixed dipyrido NHC-phosphane Pd II complexes by the oxidative addition of 6-bromodipyridoimidazolium salts is presented. This procedure avoids any transmetallation step orformation of a free carbene. Synthesis of the brominated starting material can easily be achieved by reaction of the corresponding imidazolium or benzoylimidazolium salt with bromine. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Shi Z.,Organisch Chemisches Institute | Glorius F.,Organisch Chemisches Institute
Angewandte Chemie - International Edition | Year: 2012

Complement for Fischer: An efficient palladium-catalyzed indole synthesis proceeds by the intramolecular cross-dehydrogenative coupling of N-aryl imines under mild conditions using molecular oxygen as the sole oxidant. This practical method relies on anilines and ketones as starting materials (and thus the same retrosynthetic disconnection as the Fischer indole synthesis) and will likely become a popular route. © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Piel I.,Organisch Chemisches Institute | Dickschat J.V.,University of Munster | Pape T.,University of Munster | Hahn F.E.,University of Munster | Glorius F.,Organisch Chemisches Institute
Dalton Transactions | Year: 2012

The reaction of pseudo-ortho-4,12-N,N′-diphenyldiamino-[2.2] paracyclophane ((±)-3) with Sn[N(SiMe3)2] 2 results in the formation of the monomeric planar chiral N-heterocyclic stannylene (±)-4, featuring a unique [2.2]paracyclophane backbone, which has been characterized by an X-ray diffraction study. © 2012 The Royal Society of Chemistry.

Koroniak K.,Organisch Chemisches Institute | Haufe G.,Organisch Chemisches Institute
Synthesis | Year: 2010

A series of diastereomeric fluorinated and nonfluorinated triazolo analogues of naturally occurring sphingolipids like dihydroceramide suitable for physicochemical and medicinal chemistry applications were prepared enantioselectively. Key steps of the synthetic sequence are asymmetric Sharpless dihydroxylation of α,β-unsaturated esters to diols, regioselective ring opening of derived cyclic sulfates by azide, 1,3-dipolar cycloaddition with alkynes, and reduction of the ester groups. © Georg Thieme Verlag Stuttgart New York.

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