In a large bowl, dissolve yeast in warm water. Let stand until creamy, about 10 minutes. In a small saucepan, heat the buttermilk until warm to the touch.

Pour the buttermilk and oil into the yeast mixture; mix well. Combine the flour, salt and baking soda. Stir the flour mixture into the liquid 1 cup at a time, until a soft dough forms. Turn dough out onto a lightly floured surface and knead 20 times. Cover and let rest for 15 minutes.

In a small bowl, stir together the butter, brown sugar and cinnamon.

On a lightly floured surface, roll dough out into a large rectangle. Spread the brown sugar and butter mixture over the dough, roll up into a log and pinch the seam to seal. Slice into 1-inch pieces and place cut side up in a lightly greased 10x15 baking pan. Cover and let rise 30 minutes or refrigerate overnight.