Acid-catalyzed Michael ad
Acid-catalyzed Michael addition can initiate the aza variant of this reaction, while when followed by Bergman cyclization, another variant of this reaction can yield tetrahydronaphthalene from macrolactones.  Elliot Marvell deduced the mechanism of its "abnormal" variant.  An orthoacetate is used in the (*) Johnson modification of this reaction, while an allyl ester of a carboxylic acid is used in its Ireland modification.  This reaction itself is the oxa variant of the Cope Rearrangement.  For 10 points, name this [3,3]-sigmatropic rearrangement that produces an unsaturated carbonyl from an allyl vinyl ether, named after a German chemist whose namesake condensation produces beta-keto-esters.
Acid-catalyzed Michael addition can initiate the aza variant of this reaction, while when followed by Bergman cyclization, another variant of this reaction can yield tetrahydronaphthalene from macrolactones.  
{Claisen}{ rearrangement} [accept just {Claisen} after “sigmatropic rearrangement”] (4) [DW]