Correction and removal of expression of concern: A general and concise asymmetric synthesis of sphingosine, safingol and phytosphingosines via tethered aminohydroxylation

Pradeep Kumar; Abhishek Dubey; Vedavati G. Puranik

doi:10.1039/D0OB90089C

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DOI: 10.1039/D0OB90089C (Correction) Org. Biomol. Chem., 2020, 18, 5265-5265

Correction and removal of expression of concern: A general and concise asymmetric synthesis of sphingosine, safingol and phytosphingosines via tethered aminohydroxylation

Pradeep Kumar *^a, Abhishek Dubey ^a and Vedavati G. Puranik ^b
^aDivision of Organic Chemistry, National Chemical Laboratory, Pune 411008, India. E-mail: pk.tripathi@ncl.res.in; Fax: +91-20-25902050; Tel: +91-20-25902629
^bCenter for Materials Characterization, National Chemical Laboratory, Pune 411008, India

Received 24th June 2020 , Accepted 24th June 2020

First published on 8th July 2020

Abstract

Correction and removal of expression of concern for ‘A general and concise asymmetric synthesis of sphingosine, safingol and phytosphingosines via tethered aminohydroxylation’ by Pradeep Kumar, et al., Org. Biomol. Chem., 2010, 8, 5074–5086, DOI: 10.1039/C0OB00117A.

The ¹H NMR and ¹³C NMR spectra of a number of compounds, presented in the original supporting information for this article, were inappropriately doctored to remove peaks corresponding to impurities. Replacement spectra have been provided in the revised supporting information for:

¹³C NMR: 16, 19, 20, 26, 39, 34, 35, 36, 37 and 12

¹H NMR: 26, 34, 35, 36 and 12

For compounds 16, 19, 20, 34, 35, 36, 37 and 39, the authors were able to identify raw NMR FID files for the title compounds. For compounds 26 and 12, the authors resynthesized the compounds and new NMR spectra were generated as the original data were no longer available.

The validity of the replacement spectra in the revised ESI and raw FID NMR files have been reviewed by an expert in comparison to the originally published spectra. The expert confirmed that the replacement spectra match the raw data and have not been doctored. While some of the compounds do contain impurities, the amount does not affect the main substance or conclusions of the paper.

This correction supersedes the information provided in the Expression of Concern related to this article.