Addition/Correction Cite This: Org. Lett. XXXX, XXX, XXX−XXX
pubs.acs.org/OrgLett
Correction to Fischer Carbene Catalysis of Alkynol Cycloisomerization: Application to the Synthesis of the Altromycin B Disaccharide BonSuk Koo and Frank E. McDonald* Org. Lett. 2007, 9 (9), 1737−1740. DOI: 10.1021/ol070435s
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W
e write to reassign the stereochemistry of compounds 18 and 19 (Table 1, entry 8). The error arises from a previously undetected epimerization in the Ohira−Bestmann alkynylation (K2CO3, MeOH, MeC(O)C(N2)P(O)(OMe)2, 65 °C) of acetonide-protected lyxofuranose, giving the diastereomer at the propargylic carbon of the alkynyl diol. The correct stereochemical structures are A and B.
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AUTHOR INFORMATION
Corresponding Author
*E-mail:
[email protected] ORCID
Frank E. McDonald: 0000-0002-6612-7106
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ACKNOWLEDGMENTS We thank Mr. Andrew J. Ephron and Dr. John Bacsa (Emory University) for identifying the epimerization and correcting the stereochemistry of the structures in a closely related series of compounds.
Received: May 8, 2019
© XXXX American Chemical Society
A
DOI: 10.1021/acs.orglett.9b01023 Org. Lett. XXXX, XXX, XXX−XXX