Practical asymmetric approach to medium-sized carbocycles based on the combination of two Ru-catalyzed transformations and a lewis acid-induced cyclization
(Chemical Equation Presented) Ruthenium-catalyzed coupling of allyl ethyl ether to optically active 1-trimethylsilyl-1-alkyn-3-ols, followed by in situ ketalization and Lewis-acid-induced cyclization, affords enantiomerically pure 1,5-oxygen-bridged eight
López, Fernando,Castedo, Luis,Mascare?as, José L.
p. 287 - 290
(2007/10/03)
A Facile Preparation of N-(Isopropoxyalkyl) Amides by Generation and Trapping of N-Acyliminium Ions from Ionization-Rearrangement Reactions of N-Triflyloxy Amides
A series of hydroxamic acids were converted to N-triflyloxy amides which were heated in 2-propanol to give N-(1-isopropoxyalkyl) amides in high yields.The method is simple, direct, and extremely tolerant of structural diversity both in the N-acyl group, a
Hoffman, Robert V.,Nayyar, Naresh K.
p. 3530 - 3539
(2007/10/02)
INTRAMOLECULAR DIELS-ALDER CYCLOADDITIONS OF VINYLKETENIMINES. A CONVERGENT ROUTE TO CARBAZOLES AND PYRIDOCARBAZOLE ALKALOIDS
The intramolecular Diels-Alder cycloaddition of acetylenic vinylketenimines is the key step of a highly convergent synthesis of carbazoles.A facile synthesis of N-methyl-tetrahydroellipticine has been completed in five isolated steps from N-methyl piperidone.
Differding, Edmond,Ghosez, Leon
p. 1647 - 1650
(2007/10/02)
Vinylogous Wolff Rearrangement. 4. General Reaction of β,γ-Unsaturated α'-Diazo Ketones
The preparation and vinylogous Wolff rearrangement (VWR) of some 21 acyclic and monocyclic β,γ-unsaturated α'-diazo ketones are described.The resulting γ,δ-unsaturated esters are summarized in Tables I-VI.The rearrangement is promoted by CuSO4, Cu(AcAc)2,
Smith, Amos B.,Toder, Bruce H.,Branca, Stephen J.
p. 3995 - 4001
(2007/10/02)
LONG-ACTING CONTRACEPTIVE AGENTS: LEVONORGESTREL ESTERS OF UNSATURATED ACIDS
Esters of levonorgestrel (13β-ethyl-17α-ethynyl-17β-hydroxygon-4-en-3-one) with a variety of unsaturated carboxylic acids have been synthesized for evaluation as potential long-acting, injectable contraceptive agents.
Wan, A. S. C.,Ngiam, T. L.,Leung, S. L.,Go, M. L.,Francisco, C. G.,et al.
p. 339 - 348
(2007/10/02)
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