A versatile, synthesis of β-amino acids using the Nicholas reaction. I. Application to β-lactams of the carbapenem class
作者:Peter A. Jacobi、Wanjun Zheng
DOI:10.1016/s0040-4039(00)77630-1
日期:1993.4
Homochiral acetylenic acids of general structure 10, prepared using the Schreiber modification of the Nicholas reaction, have been converted to β-amino acid derivatives of type 11 by a two steps sequence involving Curtius rearrangement followed by oxidative cleavage of the acetylenic bond. Amino acid derivatives 11 are excellent precursors for β-lactams of the carbapenem class.
Enantioselective syntheses of (+)- and (−)-Phaseolinic acid
作者:Peter A. Jacobi、Prudencio Herradura
DOI:10.1016/0040-4039(96)01941-7
日期:1996.11
(+)- and (−)-Phaseolinicacid (1) have been prepared in an enantioselective fashion from acetylenic acid 26 (or ent-26) by a three step sequence involving lactonization, epimerization at C3, and oxidative cleavage. 26 was obtained as a single enantiomer using a Nicholas-Schreiber reaction.
Formal Total Syntheses of the β-Lactam Antibiotics Thienamycin and PS-5
作者:Peter A. Jacobi、Shaun Murphree、Frederic Rupprecht、Wanjun Zheng
DOI:10.1021/jo952092u
日期:1996.1.1
Chiral nonracemic acetylenic acids of general structure 11, prepared using the Schreiber modification of the Nicholas reaction, have been converted to beta-amino acid derivatives of type 12 by a two-step sequence involving Curtius rearrangement followed by oxidative cleavage of the acetylenic bond. Amino acid derivatives 12 are excellent precursors for beta-lactams of the carbapenem class, including the important antibiotics thienamycin (1) and PS-5 (4).