Bromocyclization of Alkynyl Guanidine: A New Approach to the Synthesis of Cyclic Guanidines of Saxitoxin

[摘要]：Bromocyclization of propargyl and homopropargyl guanidines possessing homopropargyl alcohol provides five- and six-membered cyclic guanidines with spiro-hemiaminal, respectively, a candidate of precursors for saxitoxin.

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