Fragmentation of Neutral Compounds Related to Cyclopeptide Alkaloids

Fragmentation of Neutral Compounds Related to Cyclopeptide Alkaloids 

The three neutral compounds that have been isolated so far display the fragmentation behaviour of the group which they resemble scutianene-C and sanjoinenine fragment like 4(14)-frangulanine-, -inte-gerrine- and -pandamine-type cyclopeptide alkaloids, while lotusanine-B fragments like 5(14)-scutianine-A-type cyclopeptide alkaloids. 

The absence of an amino end residue leads to the absence of the corresponding fragments. Accordingly, instead of fragment a a common fragment is observed with mlz= 131 which arises from trans-cinnamic acid, the terminal fragment in all three alkaloids (59, 63, 64). 

Scutianene-C and sanjoinenine afford the following 4(14)-frangula-nine-, -integerrine- and -pandamine-type fragments e, f, h, i, 1, m, q, x, y and z. 

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