THE DIELS-ALDER REACTION OF 1-CYCLOHEXENECARBALDEHYDE NN
The synthesis of 1-cyclexenecarbaldehyde NN-dimethylhydrazone 7 from cyclexanecarbaldehyde by using a three step sequence is reported. The Diels-Alder reaction of juglone 5 with azadiene 2 provides hexahydrobenzo b phenantridine 14a in 55% yield along with tetrahydrobenzo 2? phenantridines 15a and 15b. Angular tetracyclic quinone 15a was formed in 47% yield by earring out the cycloaddition
Diels Alder Reaction - an overview ScienceDirect Topics
The Diels–Alder reaction is a well-known and established reaction in organic chemistry consisting of a highly selective 4 2 cycloaddition of a diene to an alkene dienophile to yield cyclohexene derivatives Scheme 2.8A .This reaction provides an opportunity to surpass the limitations related to the coupling of chemically sensitive bio molecules as antibodies especially in aqueous
Diels-Alder reaction of N-allylic enamides and lactam
The Diels-Alder reaction of N-allylic enamide and αβ-unsaturated lactam derivatives proceeded in the presence of I 2 at low temperature through a ionic iodolactonization intermediate. With some substrates this method of activation was proved to be more effective than by use of Lewis acids.
Type 2 Intramolecular N-Acylnitroso Diels−Alder Reaction
The type 2 intramolecular N-acylnitroso Diels−Alder reaction has been employed for the synthesis of substituted bridged bicyclic oxazinolactams. Upon oxidation of hydroxamic acid 6 a 3-benzylated oxazinolactam 7 was synthesized with complete diastereoselectivity. Elaboration of cycloadduct 7 liberated a cis-37-disubstituted azocin-2-one 9 .
Reacci\u00f3n Diels-Alder.docx - UNIVERSIDAD NACIONAL AUT
Reacci\u00f3n Diels-Alder.docx - UNIVERSIDAD NACIONAL AUT\u00d3NOMA DE M\u00c9XICO FACULTAD DE ESTUDIOS SUPERIORES CUAUTITL\u00c1N CAMPO 1 \u2013 B.Q.D QU\u00cdMICA ORG\u00c1NICA
Diels-Alder Reaction - an overview ScienceDirect Topics
Diels–Alder reactions proceed through 4 2 cycloaddition between dienophiles and dienes. C 60 reacts always as dienophile 51 while the CNTs behave as either diene or dienophile depending on the reaction partner. 52 53 Therefore the reactivity of CNTs toward Diels–Alder reactions is broad. One drawback of the Diels–Alder reaction performed onto C 60 is its reversibility which has
Diels-Alder reaction of fulvenes with N- 35
N- 35-Dichlorophenyl -maleimide reacts smoothly with a variety of substituted fulvenes 1 to give onlyendo adducts 3 independent of the nature of fulvene substituentLewis acid alyst and reaction solvent and temperature. The structure of theDiels-Alder adduct3f was determined by X-ray crystallography. Semi-empirical quantum methods AM1 were used to rationalize theendo stereoselectivity.
Intramolecular Diels-Alder reaction of N-allyl 2-furoyl
Intramolecular Diels-Alder reactions of various N-allyl 2-furoyl amides with different substituents on the nitrogen atom were investigated. The reaction of amides having bulky substituents proceeded at a faster rate than the analogs whose substituents were of less bulkiness.
Thermodynamically controlled Diels–Alder reaction of 12-N
A DFT study was performed for the Diels–Alder traction of 12-N-methylcytisine with a number of dienophiles in boiling toluene under atmospheric pressure namely N-phenylmaleimide maleic anhydride 24-benzoquinone tetracyanoethylene and methyl methacrylate. It was shown that 12-N-methylcytisine selectively reacts with these dienophiles