Preheat the oven to 350 degrees and spray a bundt pan with nonstick baking spray. 

Open the biscuits and cut into quarters. 

In a gallon sized ziplock bag, add the cinnamon and 1/3 cup of sugar. Add the biscuits and shake well to coat. 

Layer 1/3 of the biscuits in the bundt pan. Sprinkle with half the blackberries, (you may want to cut the black berries in half if they are very large.) 

Microwave the jam in a heat proof bowl until it is melted, about 30-45 seconds. Drizzle half of the jam over the biscuits and berries. 

Repeat the layers, ending with the biscuits. 

In a small sauce pan, bring the butter and the remaining 1/2 cup sugar to a boil just until the sugar dissolves. Pour the syrup over the biscuits and bake at 350 degrees for 40 minutes. Cool the monkey bread for 10 minutes in the pan before turning out onto serving dish.