Formation of Substituted Tetrahydropyrans through Oxetane Ring Opening: Application to the Synthesis of C1–C17 Fragment of Salinomycin
作者:J. S. Yadav、Vinay K. Singh、P. Srihari
DOI:10.1021/ol403604u
日期:2014.2.7
The stereoselective synthesis of C1–C17 fragment of salinomycin is achieved. The strategy employs a desymmetrization approach and utilizes an intramolecular oxetane opening reaction with O-nucleophile to result in the tetrahydropyran skeleton as the key step.
An efficient synthesis of the C1−C17 western unit of narasin was achieved from (S)-Roche ester. Highlights in our synthesis include the successful exploitation of three stereoselective sequences of Lewis acid mediated reaction followed by free-radical-based hydrogen transfer.
Synthetic routes to the stereoisomers of 2,4-dimethylpentane-1,5-diol derivatives
作者:Gemma Mas、Lluı̈sa González、Jaume Vilarrasa
DOI:10.1016/j.tetlet.2003.09.199
日期:2003.12
Five different routes to every stereoisomer of non-symmetric derivatives of 2,4-dimethylpentanedioic acid and/or of O-monoprotected 2.4-dimethylpentane-1,5-diols, which are common building blocks for the total synthesis of many polypropionates. have been investigated. Alkylation of the lithium enolate of N-propanoylpseudoephedrine turned out to be the most appropriate method. in connection with the synthesis of fragment C1-C5 of amphidinolide K. (C) 2003 Elsevier Ltd. All rights reserved.
Sefkow, Michael; Neidlein, Axel; Sommerfeld, Thimo, Liebigs Annalen der Chemie, 1994, # 7, p. 719 - 730
作者:Sefkow, Michael、Neidlein, Axel、Sommerfeld, Thimo、Sternfeld, Francine、Maestro, Miguel A.、Seebach, Dieter
DOI:——
日期:——
Siloxanes: versatile templates for acyclic stereocontrol. Synthesis of the C27-C33 segment of rapamycin
作者:Michael R. Hale、Amir H. Hoveyda
DOI:10.1021/jo00032a007
日期:1992.3
Five-membered siloxane rings may be employed to relay asymmetry along an acyclic chain in an efficient manner. Application of this method to the synthesis of the C27-C33 segment of the immunosuppressant rapamycin is reported.