Guanidine derivatives of the quinolizidine alkaloid methylcytisine were synthesized by converting its 9-amino-derivative into the corresponding thiocarboxamide using phenylisothiocyanate and then into trisubstituted guanidines using HgCl2 in the presence of aromatic amines.

中文翻译：

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甲基胞嘧啶胍衍生物的合成

通过使用异硫氰酸苯酯将其 9-氨基衍生物转化为相应的硫代甲酰胺，然后在芳香胺的存在下使用 HgCl2 转化为三取代的胍，从而合成了喹唑西啶生物碱甲基胞嘧啶的胍衍生物。