Synthesis of nucleosides and their related compounds. Part XVI. Highly stereoselective synthesis of carbocyclic analogues of oxetanocin.
作者:Nobuya KATAGIRI、Hiroshi SATO、Chikara KANEKO
DOI:10.1248/cpb.38.288
日期:——
A highly stereoselective synthetic method of trans, trans-2, 3-dihydroxymethylcyclobutylamine, a versatile precursor for carbocyclic oxetanosyl-N-glycosides, from 4-hydroxymethyl-2-pyridone has been elaborated. The method is applicable to the synthesis of either a variety of the carbocyclic oxetanosyl-N-glycosides or their cis, cis-isomers with complete stereoselection.
The efficient photochemical synthesis of 5-alkoxy- and 5-acetoxy-3-oxo-2-azabicyclo[2.2.0]hex-5-enes (2a–e and f,g), and a new rearrangement reaction of the former compounds (2a–e) to 6-alkoxy-2-pyridones (3a–e), are reported.
2-Azabicyclo[2.2.0]hexane-3,5-dione is synthesized via photopyridone formation from 4-(t-butyldimethylsilyloxy)- or 4-alkoxy-2-pyridone followed by mild acid hydrolysis and reacts with a variety of alcohols or thiols to give 4-alkoxycarbonyl- or 4-alkylthiocarbonyl-methylazetidin-2-ones.