Editing Diels–Alder reaction (section)

===Hetero-Diels–Alder===
Diels–Alder reactions involving at least one [[heteroatom]] are also known and are collectively called hetero-Diels–Alder reactions.<ref>{{cite book |last=Roush |first=W. R. |year=1991 |chapter=Intramolecular Diels–Alder Reactions |editor1-last=Trost |editor1-first=B. M. |editor2-last=Flemming |editor2-first=I. |title=Comprehensive Organic Synthesis |volume=5 |pages=513–550 |doi=10.1016/B978-0-08-052349-1.00131-1 |isbn=978-0-08-052349-1}}</ref> [[Carbonyl group]]s, for example, can successfully react with dienes to yield [[dihydropyran]] rings, a reaction known as the [[oxo-Diels–Alder reaction]], and [[imines]] can be used, either as the dienophile or at various sites in the diene, to form various ''N''-heterocyclic compounds through the [[aza-Diels–Alder reaction]]. [[Nitroso]] compounds (R-N=O) can react with dienes to form [[oxazines]]. [[Chlorosulfonyl isocyanate]] can be utilized as a dienophile to prepare [[Vince lactam]].<ref name=cb474/><ref name=grieco>{{cite journal |last1=Grieco |first1=P. A. |last2=Larsen |first2=S. D. |year=1990 |title=Iminium Ion-Based Diels–Alder Reactions: N-Benzyl-2-Azanorborene |url=http://www.orgsyn.org/Content/pdfs/procedures/CV8P0031.pdf |journal=Organic Syntheses |volume=68 |page=206 |doi=10.15227/orgsyn.068.0206}}</ref>