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Synthesis of 3,4-dihydroisoquinolines 2,2-alkyl- 6 and 2-acyl-3,4-dihydro -1(2H)-isoquinolinones 9 , 2-alkyl-1(2H)- isoquinolinones 14 , N-alkyl-3,4-dihydro-2(2H)-quinolinones 16 and N-alkyl-2(2H)-quinolinones 19 by oxidation of 1,2,3,4-tetrahydroisoquinolines 1, N-alkyl (acyl)iminium salts of...
The paper describes a convenient method for the diastereoselective synthesis of trisubstituted alkenes through the lithium amide mediated union of ketones and diethyl maleate. The reaction has been shown to proceed via a Michael Initiated- Condensation - Elimination (MICE) sequence.
The fungal antibiotics merulidial ( 1 ) and isovelleral ( 3 ) react stereoselectively with the natural triketide triacetic acid lactone ( 5 ), forming pentacyclic pyranone adducts. In buffered water solutions, the reaction rates of merulidial ( 1 ) and its less active isomer 2 are strongly...
A cyanine dye ( 4 ) bearing two boronic acids was designed and synthesized, expecting the selective binding of monosaccharides through the formation of 1:1 intramolecular complexes. While it aggregates in water, it exists discretely in water/methanol 1.1 mixed solvent. In the latter solvent the...
The synthesis is described of a modified valmomycin, which incorporates phenyl groups located around the exterior belt. The synthesis is accomplished by a build up of linear fragments using both dicyclohexylcarbodamide and pentafluoroester methods of coupling. The final cyclisation is...
A simple synthesis of (2E)-2-butyloct-2-enal, an alarm pheromone component of the African weaver ant, Oeco -phylla longinoda, and (2E)-2-tridecylheptadec-2-enal, an unusual metabolite from the red alga, Laurencia species using Baylis-Hillman adducts has been described.
In addition to conventional 1D 1 H and 13 C NMR, including DEPT and NOE methods, 2D -shift-correlated NMR techniques ( 1 H- 1 H COSY and 1 H- 13 C HMQC ) were used, providing an approach to the complete signal assignments for vitamin D analogs and model compounds. On the basis of NMR data,...
α-Nitrostyrenes react with the Reformatsky reagent to yield the corresponding 1,4-addition products. The reaction represents a practical and convenient route to ethyl 3-aryl-4-nirobutanoates.
( E )-1-Phenylsulfonyl-3-alken-2-ones as new hetero 1,3-dienes undergo smooth hereto Diels-Alder reactions with vinyl ethers in the presence of a catalytic amount of Lewis acid such as ZnI 2 , Eu(fod) 3 , and TiCl 2 ( i -PrO) 2 . The reactions are absolutely endo -selective producing 2,4- cis...
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