The syntheses of rac-inthomycin A, (+)-inthomycin B and (+)-inthomycin C using a unified synthetic approach
摘要:
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.
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