La Premiere etape de cycloaddition de la reaction croisee,quiest fortement selection vis-a-vis-a-vis de la形成 de monocycloadduits,est realisee par reactors d'un triene active avec des olenes cycliques ou celles de trienes avec des olenes acycliques Les secondes cycloadditions avec une variete de dienophiles conduisent a des bis-adduits de type croises
The first example of cross type of diene–transmissive Diels-Alder reaction is presented by the reactions of an activated cross-conjugated triene, 3-(methoxymethylene)-2,4-bis(trimethylsilyloxy)-1,4-pentadiene, with cyclic olefins as the first dienophiles and then with acetylenes as the second.
Cross type of diene-transmissive Diels-Alder cycloaddition has been demonstrated by using two bis-silyloxy cross-conjugated trienes. The first cycloaddition stage of cross reaction, which has to be highly selective in the formation of mono-cycloadducts, has been performed by the reactions of an activated triene with cyclic olefins or those of trienes with acyclic olefins.The secod cycloadditions with a variety of dienophiles provide cross types of bis-adducts. The characteristics of these cross reactios are discussed.
example for the diene-transmissive hetero Diels-Alder reaction of two bis(silyloxy) cross conjugated trienes, 3-benzylidene- and 3-(methoxymethylene)-2,4-bis(trimethylsilyloxy)-1,4-pentadiene, is presented by the reactions with azodicarbonylcompounds such as diethyl azodicarboxylate and triazolinediones. The cross type of the diene-transmissive reaction is also described.