scholarly journals Theoretical Spectroscopy of the NiIIIntermediate States in the Catalytic Cycle and the Activation of [NiFe] Hydrogenases

ChemBioChem ◽  
2013 ◽  
Vol 14 (14) ◽  
pp. 1898-1905 ◽  
Author(s):  
Tobias Krämer ◽  
Mario Kampa ◽  
Wolfgang Lubitz ◽  
Maurice van Gastel ◽  
Frank Neese
Keyword(s):  
Catalytic Cycle ◽  
Theoretical Spectroscopy

The Structure and Rearrangements of a Complete Polyketide Synthase Module During its Catalytic Cycle

Planta Medica ◽  
2013 ◽  
Vol 79 (10) ◽  
Author(s):  
DH Sherman ◽  
G Skiniotis ◽  
JL Smith ◽  
K Håkansson ◽  
S Dutta ◽  
...  
Keyword(s):  
Polyketide Synthase ◽  
Catalytic Cycle

Catalytic, Enantioselective Syn-Diamination of Alkenes

2019 ◽  
Author(s):  
Zhonglin Tao ◽  
Brad Gilbert ◽  
Scott Denmark
Keyword(s):  
General Solution ◽  
Organic Synthesis ◽  
Medicinal Chemistry ◽  
Catalytic Cycle ◽  
Bifunctional Nucleophile

The enantioselective, vicinal diamination of alkenes represents one of the stereocontrolled additions that remains an outstanding challenge in organic synthesis. A general solution to this problem would enable the efficient and selective preparation of widely useful, enantioenriched diamines for applications in medicinal chemistry and catalysis. In this Article we describe the first enantioselective, <i>syn-</i>diamination of simple alkenes mediated by a chiral, enantioenriched organoselenium catalyst together with a <i>N,N’-</i>bistosyl urea as the bifunctional nucleophile and <i>N-</i>fluorocollidinium tetrafluoroborate as the stoichiometric oxidant. Diaryl, aryl-alkyl, and alkyl-alkyl olefins bearing a variety of substituents are all diaminated in consistently high enantioselectivities selectivities but variable yields. The reaction likely proceeds through a Se(II)/Se(IV) redox catalytic cycle reminiscent of the <i>syn-</i>dichlorination reported previously. Furthermore, the <i>syn</i>-stereospecificity of the transformation shows promise for highly enantioselective diaminations of alkenes with no strong steric or electronic bias.

Nickel-Catalyzed Multicomponent Coupling Reaction of Alkyl Halides, Isocyanides and H2O: An Expedient Way to Access Alkyl Amides

Synthesis ◽  
2020 ◽  
Vol 52 (22) ◽  
pp. 3466-3472
Author(s):  
Yunkui Liu ◽  
Bingwei Zhou ◽  
Qiao Li ◽  
Hongwei Jin
Keyword(s):  
Functional Group ◽  
Coupling Reaction ◽  
Alkyl Halides ◽  
Previous Literature ◽  
Catalytic Cycle ◽  
Reaction Conditions ◽  
Multicomponent Coupling ◽  
Easy Operation

We herein describe a Ni-catalyzed multicomponent coupling reaction of alkyl halides, isocyanides, and H2O to access alkyl amides. Bench-stable NiCl2(dppp) is competent to initiate this transformation under mild reaction conditions, thus allowing easy operation and adding practical value. Substrate scope studies revealed a broad functional group tolerance and generality of primary and secondary alkyl halides in this protocol. A plausible catalytic cycle via a SET process is proposed based on preliminary experiments and previous literature.

scholarly journals Transient intermediates of the methane monooxygenase catalytic cycle.

1993 ◽  
Vol 268 (29) ◽  
pp. 21569-21577
Author(s):  
S.K. Lee ◽  
J.C. Nesheim ◽  
J.D. Lipscomb
Keyword(s):  
Methane Monooxygenase ◽  
Catalytic Cycle ◽  
Transient Intermediates

Preparation and Characterization of Oxoiron(IV) Chlorin Complexes as the First Models for a Reaction Intermediate in the Catalytic Cycle of Cytochrome d

1994 ◽  
Vol 116 (2) ◽  
pp. 634-641 ◽  
Author(s):  
Shinji Ozawa ◽  
Yoshihito Watanabe ◽  
Satoru Nakashima ◽  
Teizo Kitagawa ◽  
Isao Morishima
Keyword(s):  
Catalytic Cycle ◽  
Reaction Intermediate ◽  
Cytochrome D
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