Stereoselective reactions of N-acyl-N,O-acetals with 2-(trimethysilyloxy)furan
摘要:
Reactions of acyclic chiral N-acyl-N,O-acetals with 2-(trimethylsilyloxy)furan and BF3.Et2O produces 4-(aminoalkyl)-2-buten-4-olides in 30% to 62% yield and variable diastereomeric excesses of the syn (threo) stereoisomer. Selectivity is dependent on the structure of N-acyl-N,O-acetal used.
Indium(III) Chloride-Catalyzed Conversion of {[(Benzyloxy)carbonyl]amino}-Substituted Sulfones with 2-[(Trimethylsilyl)oxy]furan: A Facile Access to γ-Butenolactone Derivatives Containing a Protected Amino Group
Treatment of [(benzyloxy)carbonyl]amino}‐substituted sulfones 1 with 2‐[(trimethylsilyl)oxy]furan (2) in the presence of InCl3 as a catalyst at room temperature produced the γ‐butenolactone derivatives 3 and 4 containing a protected amino group (Scheme 1). The products were formed in high yields (81–92%) within 3–10 h favoring the anti‐isomer 3.