Tag: nmr

CASCADE.

CASCADE stands for ChemicAl Shift CAlculation with DEep learning. It is a stereochemically-aware graph network for the prediction of NMR chemical shifts. Model training was performed against 8,000 DFT structures followed by transfer learning with experimental  spectra. A web-server has been created to access CASCADE predictions from SMILES or by drawing structures in the graphical interface. An automated workflow executes 3D structure embedding and MMFF conformer searching. The full ensemble of optimized conformations are passed to a trained graph neural network to predict the NMR chemical shifts (in ppm) for C and H atoms. The underlying datasets used for training and the Python code to run CASCADE from the command line have been made available.

[GitHub]
Effects of substituents X and Y on the NMR chemical shifts of 2-(4-X phenyl)-5-Y pyrimidines.

Yuan, H.; Chen, P.-W.; Li, M.-Y.; Zhang, Y.; Peng, Z.-W.; Liu, W.; Paton, R. S.; Cao, C. J. Mol. Struct. 2020, 1204, 127489

Structure Determination of a Chloroenyne from Laurencia Majuscula Using Computational Methods and Total Synthesis.

Shepherd, E. D.; Dyson, B. S.; Hak, W. E.; Nguyen, Q. N. N.; Lee, M.; Kim, M. J.; Sohn, T.-I.; Kim, D.; Burton, J. W.; Paton, R. S. J. Org. Chem. 2019, 84, 4971–4991

Synthesis, Characterization, and Reactivity of Complex Tricyclic Oxonium Ions, Proposed Intermediates in Natural Product Biosynthesis.

Chan, H. S. S.; Nguyen, Q. N. N.; Paton, R. S.; Burton, J. W. J. Am. Chem. Soc. 2019, 141, 15951–15962

Asymmetric Total Syntheses and Structure Confirmation of Chlorofucins and Bromofucins.

Kim, B.; Sohn, T.; Kim, D.; Paton, R. S. Chem. Eur. J. 2018, 24, 2634–2642

Construction of 6,10-Syn- and Anti-2,5-Dioxabicyclo[2.2.1]Heptane Skeletons via Oxonium Ion Formation-Fragmentation: Prediction of Structure of (E)-Ocellenyne by NMR Calculation.

Jeong, D.; Sohn, T.-I.; Kim, J. Y.; Kim, G.; Kim, D.; Paton, R. S. Org. Lett. 2017, 19, 6252–6255

Structure Reassignment of Laurefurenynes a and B by Computation and Total Synthesis.

Shepherd, D. J.; Broadwith, P. A.; Dyson, B. S.; Paton, R. S.; Burton, J. W. Chem. Eur. J. 2013, 19, 12644–12648

Stereostructure Assignment of Flexible Five-Membered Rings by GIAO 13C NMR Calculations: Prediction of the Stereochemistry of Elatenyne.

Smith, S. G.; Paton, R. S.; Burton, J. W.; Goodman, J. M. J. Org. Chem. 2008, 73, 4053–4062