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Beilstein J. Org. Chem. 2021, 17, 28–41, doi:10.3762/bjoc.17.4
Graphical Abstract
Figure 1: Homotropane (azabicyclononane) systems.
Figure 2: Alkaloids (−)-adaline (1), (+)-euphococcinine (2) and (+)-N-methyleuphococcinine (3).
Scheme 1: Synthetic strategies before 1995.
Scheme 2: Synthesis (±)-adaline (1) and (±)-euphococcinine (2). Reagents and conditions: i) 1. dihydropyran, ...
Scheme 3: Synthesis (+)-euphococcinine (2). Reagents and conditions: i) H2O2, SeO2 (cat), acetone, rt, 88%; i...
Scheme 4: Synthesis (+)-euphococcinine (2). Reagents and conditions: i) 2,4-bis(4-phenoxyphenyl)-1,3-dithia-2...
Scheme 5: Synthesis of (±)-euphococcinine precursor (±)-42. Reagents and conditions: i) Bu3SnH, AIBN, toluene...
Scheme 6: Synthesis of (−)-adaline (1). Reagents and conditions: i) LiH2NBH3, THF, 40 °C, 88%; ii) TPAP, NMO,...
Scheme 7: Synthesis of (−)-adaline (1) and (−)-euphococcinine (2). Reagents and conditions: i) 1. BuLi, t-BuO...
Scheme 8: Synthesis of (−)-adaline (1). Reagents and conditions: i) Ref. [52]; ii) Et3N, TBDMSOTf, CH2Cl2, 0 °C t...
Scheme 9: Synthesis of (+)-euphococcinine (2). Reagents and conditions: i) 1. Cp2ZrCl2,AlMe3, CH2Cl2; 2. p-me...
Scheme 10: Synthesis of (−)-adaline 1. Reagents and conditions: i) 1. CuBr.DMS, Et2O/DMS, -42 ºC; 2. 1-heptyne...
Scheme 11: Synthesis of (−)-euphococcinine (2) and (−)-adaline (1). Reagents and conditions: i) 102, KHMDS, Et2...
Scheme 12: Synthesis of N-methyleuphococcinine 3. Reagents and conditions: i) 108 (1.5 equiv), 3,5-di-F-C6H3B(...