7,12-Dihydro-2-methyl-6/7-indolo quinolizinium chloride, deprotonation

It is interesting to note that the 7,12-dihydro-2-methyl-6H-indolo[2,3-n] quinolizinium chloride (216) (R = acetal) can be deprotonated to give the orange-yellow zwitterion 217, whereas the vinylog amide 218 is formed when R = COMe (Scheme 71). This substitution pattern gives rise to the... 

An interesting observation has been described in Section II.C.3 (Scheme 70). 7,12-Dihydro-2-methyl-6//-indolo[2,3-u]quinolizinium chloride (214) can be deprotonated to give the orange-yellow zwitterion 215 or the vinylog amide 216 depending on the substitution pattern (Scheme 104). 

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See also in sourсe #XX -- [ , ]

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