In recent years, many published reports of the use of
natural product scaffolds in combinatorial libraries have
appeared in the literature. Only a handful will be cited to
exemplify this approach. One of the earliest examples was the synthesis of a library around the sarcodictyin (55; Scheme
13) scaffold by Nicolaou et al.162 Waldmann et al. prepared
a pepticinnamin E (56; Scheme 13) library by solid-phase
synthesis.163 Solid-phase synthesis of combinatorial libraries
of epothilones (epothilone A, 57; Figure 13) was used to
probe regions of the molecule important to retention or
improvement of activity,164 and combinatorial synthesis of
vancomycin dimers yielded compounds with improved
activity against drug-resistant bacteria.165 Wipf et al. prepared
some highly modified analogues of the anti-mitotic natural
product curacin A (22; Scheme 5), and found a simpler
analogue that was more potent than curacin A in inhibiting
the assembly of tubulin.166 2,2-Dimethyl-2H-benzopyran (58;
Scheme 13) has proven to be a particularly versatile scaffold
for library synthesis; a search of the natural product literature
yielded nearly 4 000 analogues, with another 8 000 structures
identified through the inclusion of a slight modification of
the search. In one example, application of solid-phase
synthetic methods led to the identification and subsequent
optimization of benzopyrans with a cyanostilbene substitution
(59; Scheme 13) that are effective against vancomycinresistant
bacteria
In recent years, many published reports of the use of
natural product scaffolds in combinatorial libraries have
appeared in the literature. Only a handful will be cited to
exemplify this approach. One of the earliest examples was the synthesis of a library around the sarcodictyin (55; Scheme
13) scaffold by Nicolaou et al.162 Waldmann et al. prepared
a pepticinnamin E (56; Scheme 13) library by solid-phase
synthesis.163 Solid-phase synthesis of combinatorial libraries
of epothilones (epothilone A, 57; Figure 13) was used to
probe regions of the molecule important to retention or
improvement of activity,164 and combinatorial synthesis of
vancomycin dimers yielded compounds with improved
activity against drug-resistant bacteria.165 Wipf et al. prepared
some highly modified analogues of the anti-mitotic natural
product curacin A (22; Scheme 5), and found a simpler
analogue that was more potent than curacin A in inhibiting
the assembly of tubulin.166 2,2-Dimethyl-2H-benzopyran (58;
Scheme 13) has proven to be a particularly versatile scaffold
for library synthesis; a search of the natural product literature
yielded nearly 4 000 analogues, with another 8 000 structures
identified through the inclusion of a slight modification of
the search. In one example, application of solid-phase
synthetic methods led to the identification and subsequent
optimization of benzopyrans with a cyanostilbene substitution
(59; Scheme 13) that are effective against vancomycinresistant
bacteria
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