99295-72-4Relevant academic research and scientific papers
General approach for the stereocontrolled construction of the beta-lactam ring in amino acid-derived 4-alkyl-4-carboxy-2-azetidinones.
Gerona-Navarro, Guillermo,Garcia-Lopez, M Teresa,Gonzalez-Muniz, Rosario
, p. 3953 - 3956 (2007/10/03)
The first general approach toward the asymmetric synthesis of 4-alkyl-4-carboxy-2-azetidinones derived from amino acids is described. The stereoselective construction of the beta-lactam ring was achieved through base-mediated intramolecular cyclization of the corresponding N(alpha)-chloroacetyl derivatives bearing (+)- or (-)-10-(N,N-dicyclohexylsulfamoyl)isoborneol as chiral auxiliary (ee up to 82%).
Synthesis of new fluorine-containing taxoids by means of β-lactam synthon method
Ojima,Kuduk,Slater,Gimi,Sun
, p. 209 - 224 (2007/10/02)
A series of new fluorine-containing analogs of paclitaxel and docetaxel are synthesized using the coupling of (3R,4S)-1-acyl-β-lactams with high enantiomeric purity with properly protected baccatin III, 10-deacetylbaccatin III, and 14β-hydroxy-10-deacetyl
Asymmetric α-Acetoxylation of Carboxylic Esters
Oppolzer, Wolfgang,Dudfield, Philip
, p. 216 - 219 (2007/10/02)
Using the readily accessible chiral auxiliaries 1-3 the sulfonamide-shielded O-silylated esters 5 underwent ?-face-selective α-acetoxylation on successive treatment with Pb(OAc)4 and NEt3*HF to give after recrystallization α-acetoxy ester 6 in 55-66percen
ASYMMETRIC HALOGENATION OF CAMPHOR-10-SULFONIC ACID DERIVED ESTERS: AN EFFICIENT NEW ROUTE TO ENANTIOMERICALLY PURE HALOHYDRINS AND EPOXIDES.
Oppolzer, Wolfgang,Dudfield, Philip
, p. 5037 - 5040 (2007/10/02)
Successive treatment of chiral esters 1 with LDA/Me3SiCl and NBS or NCS gave crystalline α-haloesters 3 which furnished halohydrins 4 and terminal epoxides 5 in high e.e..
