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Volumn 96, Issue 1, 1996, Pages 3-30

Design constraints in practical syntheses of complex molecules: Current status, case studies with carbohydrates and alkaloids, and future perspectives

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EID: 0002530666     PISSN: 00092665     EISSN: None     Source Type: Journal    
DOI: 10.1021/cr950012g     Document Type: Review
Times cited : (221)

References (167)
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    • One of the unfortunate trends that is noticable in the literature over the last 15 years or so is the misrepresentation of reaction yields, overall yields, and the total number of steps reported for a given sequence. Although I have never met anyone in the synthetic community who did not insist on honest and realistic reporting of results, the above practice continues at an unabated pace and is apparantly tolerated by referees to a large extent. The count of steps for a total synthesis, for example, frequently begins at the stage of a "readily available" known compound, which is referenced. Thus cursory reading of such a report may give the impression that a synthesis is 12 steps long when in fact the starting material, known but not commercially available, requires eight steps to prepare. Such a practice constitutes a deliberate effort to deceive the reader. A similar argument can be made over the reporting of maximum reaction yields, a practice that is driven by competition for numbers so prevalent in our society. A random comparison of yields in the articles from the 1960s and 1970s with those in the current publications illustrates the inflation of reported yields and supports this observation. The practice of false advertising will lead to low reproducibility of results and, in the long run, to a lack of credibility for the science reported during the current period. In my opinion, it also contributes to the underappreciated standing that the chemists enjoy in the society at large. (See also section 1.2 of Seebach's essay, ref 1.) It is extremely important to provide credible information, not fast results, as part of permanent record, because the entire period will be judged by it.
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    • As incredible as this may seem, there are some in the synthetic community that openly reject the idea of enzymatic transformations as "cheating" or the "inability to design a catalyst properly" that will accomplish turnover rates similar to those of enzymes. Some views and discourse on the possible reasons for this resistance have been published: See ref 32; Brown, S. M.; Hudlicky, T. In Organic Synthesis: Theory and Applications; Hudlicky, T., Ed.; JAI Press: Greenwich, CT, 1993; Vol. 2, p 113; and the preface to the latter volume. Preparative biocatalysis, or the combination of enzymatic and chemical methods, has been accepted in the industrial world and in the academic communities of Europe and Japan. By comparison, very few research groups in the United States actively pursue research in this area. The resistance to accept this field is also reflected in the reluctant funding of such programs. In spite of the demonstrated superiority that biocatalytic design has over traditional methods of synthesis of enantiomerically pure compounds, research proposals dealing with preparation of medicinally viable targets by such methods have not been well received by the NIH system (in the author's experience). On the other hand, when the review of such proposals was conducted in the format used by the NSF, or by industrial pannels, the same proposals rejected by the former system were recommended by the latter. I do not believe that our case is unique in this regard, but I accept the premise that any new technology requires a transition period before it is accorded a permanent status.
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