摘要:
A highly efficient synthesis of the selective endothelin-converting enzyme, CGS 35066 is described. The key steps involved a Pd-catalyzed coupling of the phenyl rings of a diphenyl ether, and the use of the Schollkopf reagent, (2R)-2-isopropyl-3,6-dimethoxy-2,5-dihydropyrazine as a chiral auxiliary furnishing a dibenzofuranylmethyl substituted amino ester in high (>98%) enantiomeric purity, which was then carried forward to complete the synthesis of the ECE inhibitor CGS 35066.