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Discovery through total synthesis: a retrospective on the himastatin problem
T M Kamenecka1, S J Danishefsky
1Laboratory for Bioorganic Chemistry, Sloan-Kettering Institute for Cancer Research, New York, NY 10021, USA.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 24, 2001
Summary
Total synthesis efforts revealed that the proposed himastatin structure was incorrect, leading to a revised structure. This revised structure was confirmed via total synthesis, highlighting key synthetic strategies and identifying critical pharmacophore elements.
Area of Science:
- Organic Chemistry
- Medicinal Chemistry
- Synthetic Biology
Background:
- Himastatin is a natural product with potential biological activity.
- Previous structural assignments for himastatin required verification.
Purpose of the Study:
- To achieve a total synthesis of the proposed himastatin structure.
- To revise and confirm the stereostructure of himastatin based on synthetic findings.
Main Methods:
- Stereospecific synthesis of pyrrolindoline substructures.
- Enantioselective synthesis of 5-hydroxypiperazic acid.
- Stille coupling for bi-indole moiety construction.
- Protecting group strategies for depsipeptide synthesis.
Main Results:
- The total synthesis yielded a compound non-identical to the proposed himastatin.
- A revised stereostructure for himastatin was established and confirmed.
- Key synthetic intermediates and coupling reactions were optimized.
- Critical pharmacophore features, including alternating stereocenters and biaryl linkage, were identified.
Conclusions:
- The initial structural assignment of himastatin was revised.
- The total synthesis provided a validated route to the corrected himastatin structure.
- The identified pharmacophore elements offer insights for future drug design and structure-activity relationship studies.