(±)-<i>erythro</i>-γ,δ-Dihydroxycarboxylic Acid Lactones from a β-Lithiopropionate Equivalent and α-Chloroaldehydes
作者:Michael Plewe、Richard R. Schmidt
DOI:10.1055/s-1989-27308
日期:——
Reaction of β-ethylthio-β-lithioacrylate 1A with α-chloroaldehydes furnished predominantly the erythro products 3, which were isolated as γ-lactones 4. At room temperature intermediates 3 are transformed into the (±)-erythro-γ,δ-dihydroxycarboxylic acid γ-lactones 8. Raney nickel treatment provided interesting natural γ-lactone derivatives; thus, from erythro-8c the socalled L-factor erythro-9c was obtained. Similarly, from β-methoxy β-lithioacrylate 10A the (±)-erythro-γ,δ-dihydroxycarboxylic acid δ-lactone erythro-11 was gained.
β-乙硫基-β-锂丙烯酸酯1A与α-氯醛的反应主要生成红Arrow产物3,这些产物被分离为γ-内酯4。在室温下,中间体3转化为(±)-红Arrow-γ,δ-二羟基羧酸γ-内酯8。Raney镍处理提供了有趣的天然γ-内酯衍生物;因此,从红Arrow-8c获得了所谓的L因子红Arrow-9c。同样,从β-甲氧基β-锂丙烯酸酯10A获得了(±)-红Arrow-γ,δ-二羟基羧酸δ-内酯红Arrow-11。