Asymmetric Total Synthesis of (−)-(3<i>R</i>)-Inthomycin C
作者:Sandra Balcells、Maxwell B. Haughey、Johannes C. L. Walker、Laia Josa-Culleré、Christopher Towers、Timothy J. Donohoe
DOI:10.1021/acs.orglett.8b01370
日期:2018.6.15
A short (10 step) and efficient (15% overall yield) synthesis of the natural product (−)-(3R)-inthomycin C is reported. The key steps comprise three C–C bond-forming reactions: (i) a vinylogous Mukaiyama aldol, (ii) an olefin cross-metathesis reaction, and (iii) an asymmetric Mukaiyama–Kiyooka aldol. This route is notable for its brevity and has the advantage of lacking stoichiometric tin-promoted
The total syntheses of (+)-inthomycin A, (+)-inthomycin B and (−)-inthomycin C, the oxazole-triene antibiotics isolated from Streptomyces sp., have been accomplished via the highly enantio- and stereoselective construction of the C1–C7 (iododienyl)aldol units by taking advantage of a Cinchona alkaloid-catalyzed asymmetric β-lactone synthesis and their isomerisation-free Stille coupling with (E)-5-
Asymmetric Total Synthesis of Inthomycins A, B, and C
作者:Jae Hyun Kim、Yeonghun Song、Min Jung Kim、Sanghee Kim
DOI:10.1021/acs.joc.0c00017
日期:2020.4.3
Herein, we report the asymmetric total syntheses of inthomycin antibiotics containing a methylene-interrupted oxazolyl-triene motif. Utilizing the α,β-unsaturated aldehyde as a common intermediate, all three inthomycins A–C were divergently synthesized. The asymmetric ynone reduction provided an R-configured secondary alcohol as in the natural products with high enantioselectivity. The geometrically
The syntheses of rac-inthomycin A, (+)-inthomycin B and (+)-inthomycin C using a unified synthetic approach
作者:Michael R. Webb、Matthew S. Addie、Catherine M. Crawforth、James W. Dale、Xavier Franci、Mathieu Pizzonero、Craig Donald、Richard J.K. Taylor
DOI:10.1016/j.tet.2008.01.116
日期:2008.5
The Stille coupling between a common oxazole vinyl iodide and stereodefined stannyl-diene units is described as the cornerstone of a unified synthetic route to the inthomycin family of bioactive Streptomyces metabolites. This procedure has been utilised to prepare (+)-inthomycin B and (+)-inthomycin C for the first time; in these examples the stereogenic centre was introduced using the Kiyooka ketene acetal/amino acid-derived oxazaborolidinone variant of the Mukaiyama aldol reaction. In addition, a convenient preparation of rac-inthomycin A is described based on the same strategy. (C) 2008 Elsevier Ltd. All rights reserved.
Henkel, Thomas; Zeeck, Axel, Liebigs Annalen der Chemie, 1991, # 4, p. 367 - 373