Citation: Zhou Yuanchun, Zhou Zhi, Du Wei, Chen Yingchun. Asymmetric Inverse-Electron-Demand Diels-Alder Reaction of 2-Pyrone and 2, 5-Dienones via HOMO-Activation[J]. Acta Chimica Sinica, ;2018, 76(5): 382-386. doi: 10.6023/A18040131 shu

Asymmetric Inverse-Electron-Demand Diels-Alder Reaction of 2-Pyrone and 2, 5-Dienones via HOMO-Activation

West China School of Pharmacy, Sichuan University, Chengdu 610041

Corresponding author: Du Wei, duweiyb@scu.edu.cn Chen Yingchun, ycchen@scu.edu.cn
Received Date: 5 April 2018
Available Online: 9 May 2018
Fund Project: Project supported by the National Natural Science Foundation of China (No. 21772126) and Sichuan University Distinguished Young Scientist Program (No. 2017SCU04A15)Sichuan University Distinguished Young Scientist Program 2017SCU04A15the National Natural Science Foundation of China 21772126

Figures(4)

The bicyclic lactones possess multiple reactive sites, and are usually employed as the key intermediates in the synthesis of natural products and bioactive substances. Among the methods for the construction of these chiral skeletons, the asymmetric Diels-Alder (DA) reaction with 2-pyrone substrates represents one of the most straightforward protocols, generally with high stereocontrol. However, in regard to the electron-deficient 2-pyrone substrates, the corresponding asymmetric DA reactions usually rely on LUMO-activation by chiral Lewis acids, suffering from relatively narrow substitutions and functional group limitations. As a result, the development of new activation modes for this type of DA reactions is in high demand. Here we report an asymmetric inverse-electron-demand Diels-Alder (IEDDA) reaction of 3-methoxycarbonyl-2-pyrone and cyclic 2, 5-dienones in the presence of a primary amine derived from cinchona alkaloid, through the in situ generation of extended trienamine species. In this case, the remote δ, e-C=C bond of 2, 5-dienone substrates is activated via a HOMO-raising strategy. A variety of bicyclic lactones with contiguous stereogenic centers were produced in moderate to good yields (46%~82%) with excellent diastereo-and enantioselectivity (>19:1 dr, 93%~99% ee). In addition, the cycloadduct underwent the ring-opening reaction with methanol, affording a cyclohexenol derivative with dense substitutions in an excellent yield with a retained ee value. Therefore, the current method supplies an efficient tool to construct chiral bicyclic lactones with high molecular complexity under mild aminocatalytic conditions, which might have potential application in organic synthesis and medicinal chemistry. A representative procedure for the asymmetric IEDDA reaction is as follows:3-Methoxycarbonyl-2-pyrone 1 (0.1 mmol), cyclic 2, 5-dienone 2 (0.2 mmol), amine catalyst C2 (0.02 mmol) and acid A4 (0.04 mmol) were added into an oven-dried vial equipped with a magnetic stirbar. p-Xylene (1.0 mL) was added and the mixture was stirred at 60℃ and monitored by TLC. After completion, the residue was purified by flash chromatography on silica gel eluting with petroleum ether/ethyl acetate (8:1 to 4:1) to afford the product 3.
- trienamine,
- asymmetric catalysis,
- inverse-electron-demand Diels-Alder,
- bicyclic lactones,
- HOMO-activation
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