2
|
Craig, II RA, Roizen JL, Smith RC, Jones AC, Virgil SC, Stoltz BM. Enantioselective, Convergent Synthesis of the Ineleganolide Core by a Tandem Annulation Cascade. Chem Sci 2017; 8:507-514. [PMID: 28239443 PMCID: PMC5321630 DOI: 10.1039/c6sc03347d] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 08/15/2016] [Indexed: 12/13/2022] Open
Abstract
An enantioselective and diastereoselective approach toward the synthesis of the polycyclic norditerpenoid ineleganolide is disclosed. A palladium-catalyzed enantioselective allylic alkylation is employed to stereoselectively construct the requisite chiral tertiary ether and facilitate the synthesis of a 1,3-cis-cyclopentenediol building block. Careful substrate design enabled the convergent assembly of the ineleganolide [6,7,5,5]-tetracyclic scaffold by a diastereoselective cyclopropanation-Cope rearrangement cascade under unusually mild conditions. Computational evaluation of ground state energies of late-stage synthetic intermediates was used to guide synthetic development and aid in the investigation of the conformational rigidity of these highly constrained and compact polycyclic structures. This work represents the first successful synthesis of the core structure of any member of the polycyclic norcembranoid diterpene family of natural products. Advanced synthetic manipulations generated a series of natural product-like compounds that were shown to possess selective secretory antagonism of either interleukin-5 or interleukin-17. This bioactivity stands in contrast to the known antileukemic activity of ineleganolide and suggests the norcembranoid natural product core may serve as a useful scaffold for the development of diverse therapeutics.
Collapse
Affiliation(s)
- Robert A. Craig, II
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering , Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , USA .
| | - Jennifer L. Roizen
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering , Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , USA .
| | - Russell C. Smith
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering , Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , USA .
| | - Amanda C. Jones
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering , Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , USA .
| | - Scott C. Virgil
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering , Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , USA .
| | - Brian M. Stoltz
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering , Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , USA .
| |
Collapse
|
5
|
Chou HH, Wu HM, Wu JD, Ly TW, Jan NW, Shia KS, Liu HJ. Polyene Cyclization Promoted by the Cross-Conjugated α-Carbalkoxy Enone System. Observation on a Putative 1,5-Hydride/1,3-Alkyl Shift under Lewis Acid Catalysis. Org Lett 2007; 10:121-3. [DOI: 10.1021/ol702631q] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ho-Hsuan Chou
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C., Actimis Pharmaceuticals, Inc., 10835 Road to the Cure, Suite 200, San Diego, California 92121, and Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County 350, Taiwan, R.O.C
| | - Huang-Min Wu
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C., Actimis Pharmaceuticals, Inc., 10835 Road to the Cure, Suite 200, San Diego, California 92121, and Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County 350, Taiwan, R.O.C
| | - Jen-Dar Wu
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C., Actimis Pharmaceuticals, Inc., 10835 Road to the Cure, Suite 200, San Diego, California 92121, and Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County 350, Taiwan, R.O.C
| | - Tai Wei Ly
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C., Actimis Pharmaceuticals, Inc., 10835 Road to the Cure, Suite 200, San Diego, California 92121, and Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County 350, Taiwan, R.O.C
| | - Ning-Wei Jan
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C., Actimis Pharmaceuticals, Inc., 10835 Road to the Cure, Suite 200, San Diego, California 92121, and Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County 350, Taiwan, R.O.C
| | - Kak-Shan Shia
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C., Actimis Pharmaceuticals, Inc., 10835 Road to the Cure, Suite 200, San Diego, California 92121, and Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County 350, Taiwan, R.O.C
| | - Hsing-Jang Liu
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 30013, R.O.C., Actimis Pharmaceuticals, Inc., 10835 Road to the Cure, Suite 200, San Diego, California 92121, and Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County 350, Taiwan, R.O.C
| |
Collapse
|