Generated by SassMeister.com.

SassMeister-input-HTML.html

<ul>
  <li class="item1">Text 1</li>
  <li class="item2">Some text 2</li>
  <li class="item3">Dota 2</li>
  <li class="item4">Moon</li>
</ul>

SassMeister-input.scss

// ----
// Sass (v3.4.9)
// Compass (v1.0.1)
// ----

$colors : red, green, blue, #B0B;
$i:1;
ul li {
  @each $col in $colors {
    &.item#{$i} {
      color : $col;
    }
    $i : $i + 1;
  } 
}

SassMeister-output.css

ul li.item1 {
  color: red;
}
ul li.item2 {
  color: green;
}
ul li.item3 {
  color: blue;
}
ul li.item4 {
  color: #B0B;
}

SassMeister-rendered.html

<ul>
  <li class="item1">Text 1</li>
  <li class="item2">Some text 2</li>
  <li class="item3">Dota 2</li>
  <li class="item4">Moon</li>
</ul>