For 10 points, name this cycloaddition reaction in which a diene reacts with a dienophile to produce a ring and is named after two German chemists.
The propensity of nitroso compounds to participate in a variant of this reaction has been used to synthesize oxazine derivatives.  Another variant of this reaction yields 2,3-dihydro-4-pyridones and uses a compound named for Danishefsky. In addition to that 'aza' variation, this reaction is usually thermodynamically favorable since it sees the formation two sigma bonds from pi bonds. Under kinetic control, it preferentially yields an endo product, and one component must be in the s-cis conformation for the reaction to occur. For 10 points, name this cycloaddition reaction in which a diene reacts with a dienophile to produce a ring and is named after two German chemists.
The propensity of nitroso compounds to participate in a variant of this reaction has been used to synthesize oxazine derivatives.  
Diels-Alder Reaction [accept nitroso Diels-Alder, aza Diels-Alder, etc.]