Cleavage of 2-(1,2,3,4-tetrahydroisoquinolin-1-yl)-2-phenyl-1,3-dithianes with HgO/BF3
摘要:
The title compounds (5) were prepared by addition of 2-phenyl-1,3-dithiane anion (2-lithiated 10) to adequately substituted N-alkyl-3,4-dihydroisoquinolinium salts (7a-7g). Cleavage of compounds 5 with HgO/BF3 affords S-benzoyl-1,3-propanedithiol (4a) and the corresponding disulfide 4c, benzaldehyde, and Hg(I) ions. In contrast to the title compounds, 2-(alpha-dialkylaminobenzyl)-2-phenyl-1 ,3-dithianes (6) yield benzil under these conditions.
Stereoselective Synthesis of the Quettamine Skeleton1)
作者:Doris Dirnberger、Wolfgang Wiegrebe
DOI:10.1002/ardp.19903230603
日期:——
A synthesis of the quettamine skeleton 29 is described comprising ring closure of the diastereomeric phenolic 1‐(α‐bromobenzyl)‐tetrahydroisoquinolines 27a and 27b. In both cases only one diastereomer was obtained. NOE‐experiments confirm Shamma's23) assignments concerning the stereochemistry. ‐ Various attemps to cleave the dithiane derivative 5 of an α‐amino ketone in order to obtain the ketone 6