Yes, you can paint alkyd over latex, and it is generally easier than painting latex over oil, but proper preparation is needed for good adhesion. Latex is water-based acrylic, alkyd is oil-based, and oil can adhere to latex if latex is clean, well cured, and lightly sanded to create key. To paint alkyd over latex, clean surface with soap and water to remove dirt and grease, allow latex to cure fully, at least 30 days for fresh latex if possible, though 7 days may be enough, lightly sand with 150 to 220 grit sandpaper to degloss and roughen surface, wipe dust with tack cloth. No primer is strictly needed if latex is in good condition and you are using alkyd enamel for trim, but bonding primer improves adhesion and is recommended if latex is glossy or you are changing from dark to light. Alkyd over latex provides hard durable finish and is common for trim and cabinets previously painted with latex. Ensure good ventilation as alkyd has strong odor. So yes, you can paint alkyd over latex with cleaning, light sanding, and dust removal, and it will bond well, providing hard enamel finish.
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