Heat oven to 350 degrees F. Thoroughly grease a 10 x 4-inch tube pan.
Mix granulated sugar and 1 tablespoon cinnamon.
Cut biscuits in quarters. Roll each piece in sugar mixture. Arrange about
one-fourth of the biscuit pieces and one-fourth of the blueberries in an even
layer in pan.
Place blueberries between biscuit pieces, creating a mosaic effect.
Repeat three more times with remaining biscuits and blueberries, covering
blueberries of one layer with biscuits in next layer to avoid a column of blueberries.
In saucepan combine sugar, butter, vanilla extract, cinnamon and the additional
1 cup blueberries. Bring to a boil, reduce heat, cook, stirring frequently until
sugar is dissolved and margarine melted.