Stereoselective Synthesis of the C1–C16 Fragment of the Purported Structure of Formosalide B
journal contributionposted on 23.04.2020, 21:13 authored by Srinivas Gajula, Aedula Vishnu V. Reddy, D. Prabhakar Reddy, Jhillu S. Yadav, Debendra K. Mohapatra
The first stereoselective synthesis of the C1–C16 fragment possessing stereo-enriched fully substituted tetrahydropyran (THP) along with tetrahydrofuran (THF) rings of the proposed structure of formosalide B is described in 12 longest linear steps with 22% overall yield, starting from two cheap and commercially available 1,5-pentanediol and l-glutamic acid, following a convergent approach. The key steps involve in this synthesis are Horner–Wadsworth–Emmons reaction, Sharpless asymmetric dihydroxylation, and acid-mediated ketalization to assemble the substituted THP ring, one-pot Sharpless dihydroxylation–SN2-type cyclization, and Wittig homologation to construct the THF derivative.
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acid-mediated ketalizationHornerStereoselective Synthesistypel-glutamic acidWittig homologationFragmentTHP ringcyclizationFormosalide Bdihydroxylationstereo-enriched2-tetrahydrofuranfragmenttetrahydropyranpentanediolTHFSharplesPurported Structureformosalide Bconvergent approachone-potstereoselective synthesis