The best replacement for secondary amine is primary amine.

The best alternatives to secondary amine are rated as following:
★★★★★  primary amine
★★★  imine

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Speaking about secondary amine, one probably shouldn't forget about ketone.

Other search terms related to secondary amine and their ratings are:
★★★★★ ketone
★ acyl chloride
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secondary amine
primary amine
imine