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33644656738
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note
-
3 was totally converted into 6a over 6 h.
-
-
-
-
19
-
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33644643169
-
-
note
-
The obtention of 6a was also observed using deactivated silica gel which prevented any further purification.
-
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20
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33644655620
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33644646316
-
-
note
-
Among the different reaction conditions screened: (a) condensation without solvent at 110 °C;
-
-
-
-
24
-
-
33644647303
-
-
note
-
3CN;
-
-
-
-
25
-
-
33644653526
-
-
note
-
2 at 65 °C;
-
-
-
-
26
-
-
33644648692
-
-
note
-
2.
-
-
-
-
27
-
-
33644654121
-
-
note
-
ω-Chloro and/or ω-amino enamino esters were obtained as side products depending on the reaction conditions.
-
-
-
-
28
-
-
33644654554
-
-
note
-
2c no in situ cyclisation of intermediate 6a into compound 2a occurred during the deprotection step.
-
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29
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1342344846
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-
-
33644654262
-
-
note
-
Contrary to 2a, silica gel column chromatography of compounds 2b-d generates only a small amount of linear amines 6b-d.
-
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