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New strategies for the development of an asymmetric version of the Baylis-Hillman reaction.

P. Langer, Angew. Chem., Int. Ed. Engl., 2000, 39, 3049.

Key Words:
ACTIVATED DOUBLE-BONDS/CINCHONA ALKALOIDS/RATE ENHANCEMENT/ALDEHYDES/ESTERS/DERIVATIVES/CATALYSIS/QUINIDINE/SUBSTRATE/MECHANISM



Tetra-n-propyl ammonium perruthenate (TPAP) - an efficient and selective reagent for oxidation reactions in solution and on the solid phase.

P. Langer, J. Prakt. Chem., 2000, 342, 728.

Key Words:
propyl ammonium perruthenate oxidn solid phase review; TPAP oxidn solid phase review; propanaminium tripropyl tetraoxoruthenate oxidn review; solid phase synthesis propyl ammonium perruthenate review; soln phase synthesis propyl ammonium perruthenate review



Regio- and diastereoselective cyclization reactions of free and masked 1,3-dicarbonyl dianions with 1,2-dielectrophiles.

P. Langer, Chem. Eur. J., 2001, 7, 3858.

Key Words:
anions; cyclization; regioselectivity; silyl enol ethers; tetrahydrofurans; OXALIC-ACID DIELECTROPHILES; SILYL ENOL ETHERS; STEREOSELECTIVE SYNTHESIS; REGIOSELECTIVE SYNTHESIS; GAMMA-ALKYLIDENEBUTENOLIDES; STEREOCONTROLLED SYNTHESIS; TITANIUM TETRACHLORIDE; EFFICIENT SYNTHESIS; AMBIDENT DIANIONS; CONDENSATION



Cyclization reactions of 1,3-bis-silyl enol ethers and related masked dianions

P. Langer, Synthesis, 2002, 441.

Key Words:
1,3 dicarbonyl dianions/1,3-bis-silyl enol ethers/SET reactions/Michael reactions/cyclizations/DIELS-ALDER REACTIONS/TERT-BUTYL ACETOTHIOACETATE/STEREOSELECTIVE SYNTHESIS/<3+5>-ANNULATION REACTIONS/OXALIC-ACID/DICARBONYL ELECTROPHILES/REGIOSELECTIVE SYNTHESIS/SILYL ETHERS/GAMMA-ALKYLIDENEBUTENOLIDES/OXIDATIVE CYCLIZATION



Efficient synthesis of nitrogen heterocycles by cyclization of bis(Nucleophiles) with oxaldiimidoyl dichlorides

P. Langer, M. Doring, Eur. J. Org. Chem., 2002, 221.

Key Words:
anions/cyclizations/domino reactions/nitrogen heterocycles/regioselectivity/OXALIC-ACID DIELECTROPHILES/STEREOSELECTIVE SYNTHESIS/REGIOSELECTIVE SYNTHESIS/AMBIDENT DIANIONS/DOMINO-REACTION/BIS(IMIDOYL) CHLORIDES/BIS-IMIDOYLCHLORIDES/SCELETIUM ALKALOIDS/BUILDING-BLOCKS/SYSTEMS