Unequivocal Identification of Two-bond Heteronuclear Correlations in Natural Products at Nanomole Scale by I-HMBC

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Apr 3

PMID 37012241

Authors

Yunyi Wang

Aili Fan

Ryan D Cohen

Guilherme Dal Poggetto

Zheng Huang

Haifeng Yang

Gary E Martin

Edward C Sherer

Mikhail Reibarkh

Xiao Wang

Affiliations

Soon will be listed here.

Abstract

HMBC is an essential NMR experiment for determining multiple bond heteronuclear correlations in small to medium-sized organic molecules, including natural products, yet its major limitation is the inability to differentiate two-bond from longer-range correlations. There have been several attempts to address this issue, but all reported approaches suffer various drawbacks, such as restricted utility and poor sensitivity. Here we present a sensitive and universal methodology to identify two-bond HMBC correlations using isotope shifts, referred to as i-HMBC (isotope shift detection HMBC). Experimental utility was demonstrated at the sub-milligram / nanomole scale with only a few hours of acquisition time required for structure elucidation of several complex proton-deficient natural products, which could not be fully elucidated by conventional 2D NMR experiments. Because i-HMBC overcomes the key limitation of HMBC without significant reduction in sensitivity or performance, i-HMBC can be used as a complement to HMBC when unambiguous identifications of two-bond correlations are needed.

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