PROCESSES FOR MAKING MODULATORS OF CYSTIC FIBROSIS TRANSMEMBRANE CONDUCTANCE REGULATOR
申请人:Vertex Pharmaceuticals Incorporated
公开号:US20210246117A1
公开(公告)日:2021-08-12
The disclosure provides processes for preparing a compound of Formula (I).
该披露提供了制备化合物式(I)的过程。
[EN] PROCESSES FOR PREPARING PYRROLIDINE COMPOUNDS<br/>[FR] PROCÉDÉS DE PRÉPARATION DE COMPOSÉS DE PYRROLIDINE
申请人:VERTEX PHARMA
公开号:WO2019028228A1
公开(公告)日:2019-02-07
Processes for preparing 5,5-dimethyl-3-methylenepyrrolidin-2-one, (S)-3,5,5-trimethylpyrrolidine-2-one, (R)-3,5,5-trimethylpyrrolidine-2-one, (S)-2,4,4-trimethylpyrrolidine, and (R)-2,4,4-trimethylpyrrolidine, and their salt forms are disclosed.
The stereoselectivity of the nitrone cycloaddition with 1-substituted 3,3-methylene-5,5-dimethyl-2-pyrrolidinones 1 is discussed. C,N-Diarylnitrones give mixtures of diastereomeric spirocycloadducts 3 and 4, in which 3 always dominates. In contrast, N-methylnitrones react under the formation of 4 as major products. Cycloaddition of C-benzoyl nitrones 7 with 1 affords exclusively single isoxazolidines 8. Semi-empirical quantum mechanical methods (AM1) were used to rationalize the regio- and stereoselectivity of the reactions.
Rearrangement of 2,2,6,6-tetramethyl-4-piperidone in phase-transfer catalyzed reactions
作者:John T. Lai、Jerry C. Westfahl
DOI:10.1021/jo01296a034
日期:1980.4
Ring contraction in 2,2,6,6-tetramethylpiperidin-4-one with dichlorocarbene under phase transfer conditions