申请人:MONSANTO COMPANY
公开号:EP0561758A2
公开(公告)日:1993-09-22
The present invention is directed to synthesis of homo-β-amino acids of an optical purity sufficient to exhibit optical activity wherein Curtius rearrangement of 3-mono-substituted succinate acid half ester of an optical purity sufficient to exhibit optical activity is affected and the incipient isocyanate is trapped with a primary or secondary alcohol. The resulting carbamate-protected homo-β-amino esters are then saponified to produce the corresponding carbamate-protected homo-β-amino acids which are deprotected to yield homo-β-amino acids of an optical purity sufficient to exhibit optical activity.
本发明旨在合成光学纯度足以显示光学活性的均-β-氨基酸,其中光学纯度足以显示光学活性的3-单取代琥珀酸半酯的Curtius重排受到影响,而初生异氰酸酯被伯醇或仲醇截留。得到的氨基甲酸酯保护的均-β-氨基酯然后进行皂化,生成相应的氨基甲酸酯保护的均-β-氨基酸,再进行脱保护,生成光学纯度足以显示光学活性的均-β-氨基酸。