A diastereoselective Mannich reaction has been developed for the construction of stereogenic C−F units by the reaction of α‐fluoro‐substituted amides, including highly activated 3‐fluoro‐oxindoles, and simple linear fluoroacetamides with N‐tert‐butylsulfinylimines. This method provides a concise route to a variety of structurally diverse α‐fluoro‐β‐amino amides containing stereogenic fluorinated carbon
The observation of a large gauche preference when 2-fluoroethylamine and 2-fluoroethanol become protonated
作者:Caroline R. S. Briggs、Mark J. Allen、David O'Hagan、David J. Tozer、Alexandra M. Z. Slawin、Andr�s E. Goeta、Judith A. K. Howard
DOI:10.1039/b312188g
日期:——
The energies of the gauche and anti conformers of 2-fluoroethylamine, 2-fluoroethanol and their protonated analogues are calculated using density functional theory. Unlike the non protonated systems, the protonated systems show a strong gauche effect where the C–F and the C–+NH3 or C–F and C–+OH2 bonds are gauche rather than anti to each other. Single crystal X-ray diffraction studies of 2-fluoroethylammonium compounds identify the same conformational preference.
使用密度泛函理论计算了2-氟乙基胺、2-氟乙醇及其质子化类似物的 gauche 和 anti 构象的能量。与未质子化系统不同,质子化系统显示出强烈的gauche效应,即C–F和C–+NH3或C–F和C–+OH2键是gauche而不是anti。对2-氟乙基铵化合物的单晶X射线衍射研究确认了相同的构象偏好。
NOVEL PROCESS FOR PREPARING 3-AMINO-5-FLUORO-4-DIALKOXYPENTANOIC ACID ESTER
申请人:Shin Hyun Ik
公开号:US20100036158A1
公开(公告)日:2010-02-11
The present invention relates to a novel process for the production of 3-amino-5-fluoro-4-dialkoxypentanoic acid ester used in the precursor of 3-amino-5-fluoro-4-oxopentanoic acid, represented by the following formula (1): wherein R1 and R2 are as defined in the Description.
Novel compounds and compositions as cathepsin inhibitors
申请人:Graupe Michael
公开号:US20070049594A1
公开(公告)日:2007-03-01
The present invention relates to novel selective cathepsin S inhibitors, the pharmaceutically acceptable salts and N-oxides thereof, their uses as therapeutic agents and the methods of their making.
Process for preparing 3-amino-5-fluoro-4-dialkoxypentanoic acid ester
申请人:LG Life Sciences Ltd.
公开号:US07906676B2
公开(公告)日:2011-03-15
The present invention relates to a novel process for the production of 3-amino-5-fluoro-4-dialkoxypentanoic acid ester used in the precursor of 3-amino-5-fluoro-4-oxopentanoic acid, represented by the following formula (I): wherein R1 and R2 are as defined in the Description.