Preheat oven to 350 degrees with the rack set in the center. Spray a 9x5-inch loaf pan with nonstick cooking spray and line with parchment, leaving a two inch over hang on both sides. Spray parchment.
In a large bowl, whisk together the yogurt, sugar, eggs, lemon zest, vanilla and vegetable oil until smooth. Sift in 1 ½ cups of flour, baking powder and salt, then whisk to combine. In a small bowl toss raspberries with remaining 1 teaspoon of flour until coated, then fold into batter, being sure not to overmix and smash the raspberries. Transfer batter to prepared loaf pan and bake until a toothpick inserted into the center of the cake comes out clean, and the loaf is a deep golden brown, 55-60 minutes. If edges begin to brown too much, cover pan with foil
Remove from oven and allow to cool in the pan on a cooling rack for 5 minutes
To make the syrup, in a small saucepan over medium heat, simmer the lemon juice and granulated sugar until syrupy, about 2 minutes. Using a long wooden skewer, pierce the sides and bottom of the warm cake at least 1 inch all over. Brush the cake generously with the syrup.
To make the glaze, in a small bowl, stir together the powdered sugar and lemon juice until smooth. When the cake is completely cool, turn it right side up and drizzle the glaze over the top.