2 article(s) from Willms, J. Alexander
Charge-tagged L-proline-derived catalyst 1∙Cl .
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Putative catalytic cycle  for the L-proline-catalyzed Diels–Alder reaction with inverse electron de...
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Synthesis of the charge-tagged tetrazine 4∙Br as a reactant for the proline-catalyzed Diels–Alder r...
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Reaction R1: L-proline-catalyzed reaction between 2 and acetone.
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NMR monitoring of reaction R1 in deuterated DMSO (concentration of tetrazine 0.005 mmol/mL).
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Equilibrium of oxazolidinone and enamine formation.
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a) ESI mass spectrum of reaction R1 after 26 min. b) ESIMS monitoring of reaction R1. To better vis...
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ESI mass spectrum of reaction R1 with preformed I1 8 minutes after adding substrate 2.
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Reaction R2: L-proline-catalyzed reaction between charge-tagged substrate 4∙Br and acetone. The reg...
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ESI mass spectrum of reaction R2 using a continuous-flow setup with a calculated reaction time of 8...
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a) Reaction R2 after two hours (syringe setup). b) ESIMS monitoring of reaction R2. Signal intensit...
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Reaction R3: substrate 2, acetone and charge-tagged catalyst 1∙Cl.
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ESI mass spectrum of reaction R3 at 60 °C after 1.5 h.
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General catalytic cycle for reactions R1–R3.
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ESIMS monitoring of reaction R3. The plotted intensity values for each molecule are a sum of all co...
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Isomeric forms in equilibrium: enamine [I3a]+, oxazolidinone [I3b]+ and iminium [I3c]+.
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ESI(+) CID spectrum of mass-selected [I3]+ (m/z 353); collision energy voltage 1 V.
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ESI(+) CID spectrum of mass selected [II3]+ (m/z 589); collision energy voltage 5 V.
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ESI(+) CID spectrum of mass selected [III3]+ (m/z 561); collision energy voltage 10 V.
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Beilstein J. Org. Chem. 2019, 15, 30–43, doi:10.3762/bjoc.15.3
The new charge-tagged proline-derived catalyst 1.
Inverse aldol reaction with aldehyde donors according to Jørgensen . We studied the reaction for R ...
Synthesis of 4-(pyridin-4-yl)phenol (5).
Synthesis of the charge-tagged proline catalyst 1.
Molecular structure of 7 in the solid state.
Proposed catalytic cycle [36-38] for the aldol reaction with aldehyde donors ; CT = charge tag, a: R = Ph, ...
Experimental setup for continuous-flow ESIMS experiments using two mixing tee microreactors directl...
ESI mass spectra of acetonitrile solutions of diethyl ketomalonate and butyraldehyde (a) with unmod...
ESI(+) CID MS/MS spectra of mass-selected intermediates a) [IIb]+, b) the butyl ester derivative [I...
Normalized relative intensities in ESI spectra recorded for the inverse aldol reaction of butyralde...
Beilstein J. Org. Chem. 2014, 10, 2027–2037, doi:10.3762/bjoc.10.211
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