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Beilstein J. Org. Chem. 2021, 17, 2543–2552, doi:10.3762/bjoc.17.170
Graphical Abstract
Figure 1: Examples of 2,3-dihydro-1H-pyrrolizines (1–7) and 5,6,7,8-tetrahydroindolizines (8–10).
Scheme 1: Previous [18] and proposed routes to 2,3-dihydro-1H-pyrrolizines from enaminones. Reagents and conditio...
Scheme 2: Synthesis of pyrrolizine 19a from lactam 16 via enaminone 15a. Reagents and conditions: (i) NaH, TH...
Scheme 3: Proposed mechanism for the formation of pyrrolizidine 19a from enaminone (E)-15a.
Scheme 4: Synthesis of tetrahydroindolizines 26a–c from lactam 23 via enaminones 25a–c. Reagents and conditio...
Scheme 5: Further functionalization of dihydropyrrolizine 19a. Reagents and conditions: (i) NBS, DMF, 0 °C, 1...