Stir soy sauce, maple syrup, garlic, ginger, scallion and cayenne together in a small bowl until blended thoroughly.
Put pork chops in a resealable plastic bag and then pour marinade into bag, over chops. Seal bag while carefully squeezing out any air, and then shake to coat meat evenly. Marinate in refrigerator for at least 30 minutes or as long as overnight. (These pork chops will not take long to cook, so start to prepare side dishes- like herbed rice and steamed beans-at this point.)
Prepare grill and cook pork chops over medium heat until golden and cooked through, about 6 minutes per side.