Regio- and stereoselective alkylation of a pyrrolidinic system: Structural and conformational studies by high field NMR techniques
作者:M. Schaefer、P. Faller、D. Nicole
DOI:10.1002/mrc.1270190214
日期:1982.6
AbstractA new merocyanine was prepared by addition of the pyrrolidine enamine of N‐ethoxycarbonylpyrrolidine‐3‐one to 1‐octyne‐3‐one. This addition was regioselective (with an unexpected C‐4 alkylation of the pyrrolidinone‐3‐enamine) and stereospecific (exclusively trans addition to the triple bond). The structure and conformational equilibrium were studied by high resolution proton magnetic resonance (NOE and variable temperature effects). Activation parameters ΔH*, ΔS* and ΔG* are given, and the behaviour on protonation examined.
1-Pyrrole- and 1-pyrrolidine-carboxylic acid derivatives and process for
申请人:LABAZ
公开号:US04299768A1
公开(公告)日:1981-11-10
1-Pyrrole- and 1-pyrrolidine-carboxylic acid derivatives corresponding to the general formula: ##STR1## in which R represents an alkyl radical having from 1 to 4 carbon atoms, preferably ethyl, and Am represents a group: ##STR2## wherein R.sub.1 represents a 3-oxo-alkyl radical ##STR3## or a 3-oxo-alkenyl radical ##STR4## and R.sub.2 represents hydrogen or R.sub.1 and R.sub.2, when they are identical, each represent hydrogen, ##STR5## R.sub.3 representing an alkyl radical having from 1 to 5 carbon atoms with the proviso that when R.sub.1 and R.sub.2 are simultaneously hydrogen, Am represents the group A. The novel derivatives are useful as intermediates for synthetizing azaprostaglandines.