180776-46-9Relevant academic research and scientific papers
Total synthesis of (+)-sinefungin
Ghosh, Arun K.,Liu, Wenming
, p. 6175 - 6182 (2007/10/03)
Sinefungin (1) a nucleoside antibiotic isolated from Streptomyces has been synthesized from D-ribose. Both the C-6 and C-9 stereogenic centers were constructed by efficient asymmetric syntheses. The C-6 amine stereochemistry was set by a highly diastereoselective allylation (> 99% de) of a (1S,2R)-1-amino-2-indanol-derived oxazolidinone 9 followed by a Curtius rearrangement of 11 to 12. The C-9 amino acid stereochemistry of sinefungin (1) was established by a rhodium chiral bisphosphine-catalyzed asymmetric hydrogenation of an α-(acylamino)acrylate derivative. The anomeric adenosylation of the mixture of anomeric acetates 20 in the presence of C-6 urethane NH was found to be extremely difficult. Conversion of the C-6 urethane NH as its N-benzyl derivative 21 was necessary prior to the adenosylation reaction. Successful adenosylation was effectively carried out by Vorbruggen's protocol utilizing persilylated N6-benzoyladenine and trimethylsilyl triflate.
