ChemInform Abstract: USE OF LIQUID-CRYSTAL-INDUCED CIRCULAR DICHROISM FOR DETERMINATION OF ABSOLUTE CONFIGURATION OF ALCOHOLS AND OXAZIRIDINES

1980 ◽  
Vol 11 (37) ◽  
Author(s):  
W. H. PIRKLE ◽  
P. L. RINALDI
Keyword(s):  
Circular Dichroism ◽  
Liquid Crystal ◽  
Absolute Configuration ◽  
Induced Circular Dichroism ◽  
Determination Of Absolute Configuration ◽  
Circular Dichroïsm

(-)-Strempeliopine, stereoselective total synthesis and the determination of absolute configuration

1986 ◽  
Vol 51 (8) ◽  
pp. 1731-1742 ◽  
Author(s):  
Josef Hájíček ◽  
Jan Trojánek
Keyword(s):  
Circular Dichroism ◽  
Total Synthesis ◽  
Absolute Configuration ◽  
Determination Of Absolute Configuration ◽  
Natural Base ◽  
The Absolute ◽  
Circular Dichroïsm

A synthesis of (±)-strempeliopine (II) is described, the key step of which is the stereoselective reductive rearrangement of 18-methylene-1,2-dehydroaspidospermidine (XI). The absolute configuration of the natural (-)-base II was determined as (2S, 7R, 20R, 21R) on the basis of its synthesis from (+)-18-methylenevincadifformine (XVII) the configuration of which was derived from a comparison of circular dichroism properties of bases with a β-anilinoacrylate chromophore. The biogenesis of the alkaloids of the schizozygane type is discussed.

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