申请人:Board of Regents, The University of Texas System
公开号:US05220016A1
公开(公告)日:1993-06-15
The invention is a de novo synthesis of the norcatharanthine moiety of navelbine. The synthesis includes condensing a Grignard reagent prepared from an amine-protected R(+)-piperidinyl methanol with an N-protected 2-methoxyoxalyl indole. The indole N-protecting group is removed to provide a 2-methoxyindole hydroxy ester which is coupled to vindoline. After removal of the amineprotecting group from the piperidinyl group, ring closure to the indole moiety provides dihydrodesethyl navelbine. Other derivatives and analogs of navelbine with potential clinical applications in cancer chemotherapy may be readily synthesized. The synthesis opens a route to a wide variety of navelbine modifications, including modifications at or near the tryptamine bridge.
REAGENT FOR MEASUREMENT OF CHOLINESTERASE ACTIVITY
申请人:Kikuchi Tatsuya
公开号:US20120107854A1
公开(公告)日:2012-05-03
An N-alkylpiperidine methanethiol ester derivative represented by any one of the general formulae (1) to (4) or a salt thereof has been discovered. The N-alkylpiperidine methanethiol ester derivative or the salt thereof has specificity for acetylcholinesterase or butyrylcholinesterase and is useful as a reagent for measurement of cholinesterase activity by the Ellman method.
Sandborn; Marvel, Journal of the American Chemical Society, 1928, vol. 50, p. 565
作者:Sandborn、Marvel
DOI:——
日期:——
Chemoselective Deprotection of Allylic Amines Catalyzed by Grubbs’ Carbene
作者:Benito Alcaide、Pedro Almendros、José Alonso、Amparo Luna
DOI:10.1055/s-2004-831211
日期:——
A commercially available ruthenium complex (first generation Grubbs’ carbene) was used for the catalytic deprotection of allylic amines (secondary as well as tertiary), by using for the first time reagents different from palladium catalysts. Interestingly, the catalytic system directs the reaction toward the selective deprotection of allylamines in the presence of allylic ethers.