Auf das Zentralnervensystem wirkende Substanzen XXV. Reaktionen der ?-substituierten ?-Lactone II. Eine neue allgemeine Synthese ?-substituierter Propions�uren und deren Derivate
作者:Bruno J. R. Nicolaus、Luigi Mariani、Emilio Testa
DOI:10.1002/hlca.19610440427
日期:——
Hydrochloric acid and hydrobromic acid react with α-mono- and α, α-disubstituted β-lactones under ring cleavage leading unequivocally to the corresponding α-mono- or α, α-disubstituted β-halogenopropionic acids. These products are interesting starting materials for the preparation of new compounds and can be reduced by zinc and formic acid to the corresponding propionic acids. The described synthesis
盐酸和氢溴酸在环裂解下与α-单-和α,α-二取代的β-内酯反应,明确导致相应的α-单-或α,α-二取代的β-卤代丙酸。这些产品是制备新化合物的有趣原料,可以通过锌和甲酸还原为相应的丙酸。所描述的合成是一般的合成并且可以高收率进行。此外,已经观察到,新的α,α-二取代的β-卤代丙酸可以通过碱的作用或在中性或弱酸性介质中通过锌的作用而被转化为β-丙内酯。