Synthesis of (4S)- and (4R)-methyl 2-amino-1-pyrroline-5-carboxylate and their application to the preparation of (4S)-(+)- and (4R)-(-)-dihydrokikumycin B
Identification of a Pyrrole Intermediate Which Undergoes C‐Glycosidation and Autoxidation to Yield the Final Product in Showdomycin Biosynthesis
作者:Daan Ren、Minje Kim、Shao‐An Wang、Hung‐wen Liu
DOI:10.1002/anie.202105667
日期:2021.7.26
decarboxylation and deamination to afford showdomcyin after exposure to air. These results suggest that showdomycin could be an artifact due to aerobic isolation; however, the autoxidation may also serve to convert an otherwise inert product of the biosynthetic pathway to an electrophilic C-nucleotide thereby endowing showdomycin with its observed bioactivities.
Enantioselective Reduction of Electrophilic C?C Bonds with sodium tetrahydroborate and ?semicorrin? cobalt catalysts
作者:Marian Misun、Andreas Pfaltz
DOI:10.1002/hlca.19960790404
日期:1996.6.26
‘Semicorrin’ cobaltcomplexes, prepared in situ from cobalt(II) chloride and the corresponding ligands, are efficient catalysts for the enantioselective reduction of electrophilic CC bonds with NaBH4. The best selectivities (> 90% ee) are achieved with α,β-unsaturated carboxamides and carboxylates. Analogous α,β-unsaturated nitriles, sulfones, and phosphonates afford enantiomeric excesses of 50–70%