70354-71-1Relevant articles and documents
Synthesis of (+)-phenserine using an interrupted Fischer indolization reaction
Schammel, Alex W.,Chiou, Grace,Garg, Neil K.
, p. 725 - 728 (2012)
A concise synthesis of the Alzheimer's therapeutic (+)-phenserine is described. The approach features an interrupted Fischer indolization to construct the pyrrolidinoindoline core, in addition to a classical resolution to arrive at phenserine in enantioenriched form.
Palladium-catalyzed enantioselective domino heck-cyanation sequence: Development and application to the total synthesis of esermethole and physostigmine
Pinto, Artur,Jia, Yanxing,Neuville, Luc,Zhu, Jieping
, p. 961 - 967 (2007/10/03)
An efficient synthesis of functionalized 3-alkyl-3-cyanomethyl-2-oxindole 1 by a palladium-catalyzed domino Heck-cyanation reaction has been developed. Reaction of ortho-iodoanilide 5 with potassium ferro(II)cyanide, K 4[Fe(CN)6], dissolved in DMF in the presence of palladium acetate and sodium carbonate afforded oxindole 1 in good to excellent yields. An enantioselective domino Heck-cyanation process has been developed for the first time using (S)-DIFLUORPHOS as a chiral supporting ligand, and an enantioselectivity of up to 79% ee in the enantiomerically enriched oxindole was obtained under optimized conditions. A concise total synthesis of esermethole and physostigmine, powerful inhibitors of acetyl- and butyryl-cholinesterase, is documented.
2-Azonianorbornene-2-spiro-1'-aziridinium triflate - A novel ethylene immonium ion equivalent: Application to a synthesis of physostigmine
Grieco,Carroll
, p. 4401 - 4404 (2007/10/02)
A unique protocol for either the aminoethylation or the N-methyl aminoethylation of carbonyl compounds featuring the preparation and use of a novel spiroaziridinium salt, 2-azonianorbornene-2-spiro-1'-aziridinium triflate 2, is described.