Example code for the case to always use quotes in Sass maps.

colors-with-quoted-keys.scss

$colors: (
	"blue":   "#2b55f3",
	"green":  "#39dd4a",
	"yellow": "#f0f30f",
	"red":    "#ff2e35",
	"orange": "#f8ad55",
);

@each $name, $color in $colors {
	.#{$name} {
		color: $color;
	}
}

colors-with-unquoted-keys.scss

$colors: (
	blue:   "#2b55f3",
	green:  "#39dd4a",
	yellow: "#f0f30f",
	red:    "#ff2e35",
	orange: "#f8ad55",
);

@each $name, $color in $colors {
	.#{$name} {
		color: $color;
	}
}

compressed-expected.scss

.blue{color:"#2b55f3"}.green{color:"#39dd4a"}.yellow{color:"#f0f30f"}.red{color:"#ff2e35"}.orange{color:"#f8ad55"}

error.log

Invalid CSS after ".": expected class name, was "#ff0"