期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 37, 页码 17277-17294出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c08136
关键词
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资金
- National Institutes of Health [NIGMS MIRA R35 GM130345]
- Defense Advanced Research Projects Agency [HR00111890024]
- National Science Foundation Graduate Research Fellowships Program [DGE 1752814]
- Uehara Memorial Foundation
- NIH [S10OD024998]
This article describes the synthesis of longiborneol and related natural products. Through clever strategies and late-stage functionalizations, longiborneol and its derivatives were successfully synthesized. The methods employed in this study require extensive optimization but allow for functionalization of every C-H bond in the longiborneol skeleton.
Detailed herein are our synthesis studies of longiborneol and related natural products. Our overarching goals of utilizing a camphor first strategy enabled by skeletal remodeling of carvone, and late-stage diversification using C-H functionalizations, led to divergent syntheses of the target natural products. Our initial approach proposed a lithiate addition to unite two fragments followed by a Conia-ene or Pd-mediated cycloalkylation reaction sequence to install the seven-membered ring emblematic of the longibornane core. This approach was unsuccessful and evolved into a revised plan that employed a Wittig coupling and a radical cyclization to establish the core. A reductive radical cydization, which was explored first, led to a synthesis of copaborneol, a structural isomer of longiborneol. Alternatively, a metal-hydride hydrogen atom transfer-initiated cydization was effective for a synthesis of longiborneol. Late-stage C-H functionalization of the longibornane core led to a number of hydroxylated longiborneol congeners. The need for significant optimization of the strategies that were employed as well as the methods for C-H functionalization to implement these strategies highlights the ongoing challenges in applying these powerful reactions. Nevertheless, the reported approach enables functionalization of every natural product-relevant C-H bond in the longibornane skeleton.
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