Preheat oven to 350 degrees In a bowl, combine flour, sugar, baking soda, salt and cinnamon.. Pour juice off can of pineapple into 1 cup measuring cup-it should be about 3/4 cup juice. Add water to make 1 cup.
In a separate bowl, combine the pineapple juice, oil, and vinegar.
Dump pineapple chunks into the bottom of a 12" spring form pan (you could use an 8" x 8" or other sized spring form, just adjust cooking time). Sprinkle with brown sugar.
Quickly mix wet ingredients into dry, stirring quickly to combine ingredients well and get out the big lumps. Pour into pan on top of the pineapple/brown sugar mix.
Bake for 25 to 35 minutes, or until golden on top and a toothpick inserted in the center comes out clean. (Baking time will depend on pan size).
Let cool and loosen sides of cake from pan. Remove side ring and place serving plate on top. Flip cake over onto serving plate and remove pan bottom. Drizzle on a simple powdered sugar glaze.