High-Throughput in Silico Structure Validation and Revision of Halogenated Natural Products Is Enabled by Parametric Corrections to DFT-Computed13C NMR Chemical Shifts and Spin-Spin Coupling Constants.
Halogenated natural products constitute diverse and promising feedstock for molecular pharmaceuticals. However, their solution-structure elucidation by NMR presents several challenges, including the lack of fast methods to compute13C chemical shifts for carbons bearing heavy atoms. We show that parametric corrections to DFT-computed chemical shifts in conjunction with rff-computed spin-spin coupling constants allow for fast and reliable screening of a large number of reported halogenated natural products, resulting in expedient structure validation or revision. In this paper, we examine more than 100 structures of halogenated terpenoids and other natural products with the new parametric approach and demonstrate that the accuracy of the combined method is sufficient to identify misassignments and suggest revisions in most cases (16 structures are revised). As the 1D1H and13C NMR data are ubiquitous and most routinely used in solution structure elucidation, this fast and efficient two-criterion method (nuclear spin-spin coupling and13C chemical shifts) which we term DU8+ is recommended as the first essential step in structure assignment and validation.
Department of Chemistry and Biochemistry, University of Denver , Denver, Colorado 80208, United States.
Andrei G
0000-0003-3066-517X
AG
Kutateladze
Department of Chemistry and Biochemistry, University of Denver , Denver, Colorado 80208, United States.
D Sai
DS
Reddy
D001688:Biological Products / Q000737:chemistry*; D066241:Carbon-13 Magnetic Resonance Spectroscopy; D054879:Halogenation; D057166:High-Throughput Screening Assays; D015394:Molecular Structure; D011789:Quantum Theory
D001688:Biological Products