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- W2049831433 abstract "A study of the utility of furan-terminated N-acyliminium ion initiated cyclizations for the synthesis of linearly fused alkaloid precursors (Figure 2) is presented. The outcome of the cyclization event depends on the position of furan tether attachment (2 vs 3), tether length, and furan 5-substituent (R = H, CH(3), Ar). 3-Substituted furans cyclized to form 6- and 7-membered ring containing furans 35-38, 50, and 51 in good to excellent yields. 2-Substituted furans closed to form only 6-membered rings; however, the products obtained were a function of the furan 5-substituent. The 5-H furans 17 and 18 led exclusively to the corresponding furans 21 and 22, while the 5-CH(3)-furans 42 and 43 gave only diketone containing compounds 44 and 45. 5-Arylfurans 66-71 provided mixtures of furan- and diketone-containing products 72-83, with the ratio related to the substitution on the phenyl moiety. A preparation of epilupinine 10 is also discussed." @default.
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- W2049831433 date "2010-06-17" @default.
- W2049831433 modified "2023-09-27" @default.
- W2049831433 title "ChemInform Abstract: Furan-Terminated N-Acyliminium Ion Initiated Cyclizations in Alkaloid Synthesis." @default.
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- W2049831433 doi "https://doi.org/10.1002/chin.199910151" @default.
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