This research program (CA-19033), now in the thirty-sixth year, embodies our long-term commitment to complete structural characterization and efficient enantiomeric synthesis of architecturally challenging agents, possessing bio-regulatory properties related to cancer chemotherapy. Specifically, we will demonstrate that Anion Relay Chemistry (ARC), a tactic introduced by our laboratory, holds great promise for the rapid, efficient construction of multi-gram quantities of stereo-defined, structurally complex synthetic intermediates and natural products having cancer cell growth inhibitory activities. Anion Relay Chemistry (ARC), the principal chemical innovation of this program, originated from a three-component union protocol, that comprises a [1,4]-Brook rearrangement to assemble complex arrays, employed initially for the total synthesis of the spongistatins 1 and 2. Subsequently, we generalized this concept to what we now term Anion Relay Chemistry (ARC). The proposed four-year application will significantly augment, demonstrate and showcase the utility of the ARC tactics for the rapid access to complex molecular architecture. With this introduction, the Specific Aims of years 37-40 will be: (A) to apply multiple iterations of the ARC three-component fragment union to achieve the rapid syntheses of polyol-containing anticancer natural products, including cryptocaryols A and B and the bastimolides A-C; (B) to develop a new ARC tactic to introduce branching points diastereoselectively on otherwise linear multi-component adducts. This tactic will be applied first to the total synthesis of anticancer natural product pterocidin. Given the unusual mechanism of action of pterocidin, the availability of the latter in significant quantity holds promise to open new doors in cancer biology. We will also: (C) showcase the utility of the ARC tactic for the total synthesis of the natural products nahuoic acid A and mandelalide A, both exhibiting nanomolar cytotoxicity against human cancer cell lines. In addition, we will: (D) develop a solid-supported variant of the ARC protocols to permit the rapid assembly of complex polyketide precursors with increased efficiency and virtually no purification. Finally, we will: (E) evaluate the cytotoxic/cancer biology of the natural products ad analogs thereof, through collaboration with world-class molecular pharmacologists. Beyond these specific synthetic objectives, a general, long-range goal of this program is the identification of molecular architectures responsible for inhibition of tumor cell growth.
The overarching goal of this research program has been, and will continue to be, the full characterization, structural assignment, and efficient enantioselectie total syntheses of architecturally novel, naturally occurring compounds that hold significant potential as new chemotherapeutic agents to be evaluated for clinical intervention in the treatment of cancer. To this end, new synthetic chemistry involving Anion Relay Chemistry will be developed that will have utility not only for this program, but also be of general value to the academic and pharmaceutical communities engaged in Cancer Biology.
|Nguyen, Minh H; Imanishi, Masashi; Kurogi, Taichi et al. (2018) Synthetic Access to the Mandelalide Family of Macrolides: Development of an Anion Relay Chemistry Strategy. J Org Chem 83:4287-4306|
|Ai, Yanran; Kozytska, Mariya V; Zou, Yike et al. (2018) Total Synthesis of the Marine Phosphomacrolide, (-)-Enigmazole A, Exploiting Multicomponent Type I Anion Relay Chemistry (ARC) in Conjunction with a Late-Stage Petasis-Ferrier Union/Rearrangement. J Org Chem 83:6110-6126|
|Zou, Yike; Li, Xiangqin; Yang, Yun et al. (2018) Total Synthesis of (-)-Nodulisporic Acids D, C, and B: Evolution of a Unified Synthetic Strategy. J Am Chem Soc 140:9502-9511|
|Deng, Yifan; Liu, Qi; Smith 3rd, Amos B (2017) Oxidative [1,2]-Brook Rearrangements Exploiting Single-Electron Transfer: Photoredox-Catalyzed Alkylations and Arylations. J Am Chem Soc 139:9487-9490|
|Montgomery, Thomas D; Smith 3rd, Amos B (2017) ?-Silyl Amides: Effective Bifunctional Lynchpins for Type I Anion Relay Chemistry. Org Lett 19:6216-6219|
|Liu, Qi; Deng, Yifan; Smith 3rd, Amos B (2017) Total Synthesis of (-)-Nahuoic Acid Ci (Bii). J Am Chem Soc 139:13668-13671|
|Liu, Qi; Chen, Yu; Zhang, Xiao et al. (2017) Type II Anion Relay Chemistry: Conformational Constraints To Achieve Effective [1,5]-Vinyl Brook Rearrangements. J Am Chem Soc 139:8710-8717|
|Nazari, Mohamad; Serrill, Jeffrey D; Wan, Xuemei et al. (2017) New Mandelalides Expand a Macrolide Series of Mitochondrial Inhibitors. J Med Chem 60:7850-7862|
|Nguyen, Minh H; Imanishi, Masashi; Kurogi, Taichi et al. (2016) Total Synthesis of (-)-Mandelalide A Exploiting Anion Relay Chemistry (ARC): Identification of a Type II ARC/CuCN Cross-Coupling Protocol. J Am Chem Soc 138:3675-8|
|Adams, Gregory L; Smith 3rd, Amos B (2016) The Chemistry of the Akuammiline Alkaloids. Alkaloids Chem Biol 76:171-257|
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