Assymetric formal synthesis of (−)-formoterol and (−)-tamsulosin
摘要:
Biologically important (2R)-2-amino-3-phenylpropanes consisted in commercial drugs including (R,R)-formoterol, and (R)-tamsulosin were prepared from chiral (2R)-aziridine-2-carboxylate without any chromatographic separation. Key reactions include regio- and stereoselective ring opening reaction of aziridin-2-yl-phenylmethanol and subsequent cyclization toward enantiopure 4,5-disubastitued oxazolidin-2-ones as synthetic intermediates.
Syntheses of tetrahydropyridin-3-ol and tetrahydroazepin-3-ol from a chiral aziridine-2-carboxylate
作者:Hyeon Kyu Lee、Jung Hee Im、Sang Hun Jung
DOI:10.1016/j.tet.2007.02.045
日期:2007.4
(1) stereoselective reduction of an acyl-aziridine intermediate derivedfrom the aziridine-2-carboxylate, (2) regioselective aziridine ring opening, (3) N-allylation, and (4) ring-closing metathesis. The method developed in this investigation provides ready access to stereochemicallydefined and highly functionalized 3-hydroxy-substituted tetrahydropyridines and tetrahydroazepines.