Lithium borotritide reduction of α-ionylidene-acetaldehyde (5) followed by manganese dioxide oxidation provided the tritiated aldehyde (9) which retainad over 95% of the label. On treatment with the ylide derived from ethyl 4-chloro-3-methylcrotonate, ethyl α-retinoate-11-3H (14) was obtained which, after purification, was hydrolyzed to α-retinoic-11-3H acid (15). Conversion to the methyl ester (16) followed by lithium aluminum hydride reduction yielded all trans- α-retinol (17) which was isolated as the acetate derivative (18).
硼氮化锂还原 α-亚亚基
乙醛 (5),然后进行
二氧化锰氧化,得到氚化醛 (9),其保留了超过 95% 的标记。用衍生自4-
氯-3-甲基
巴豆酸乙酯的叶立德处理,得到α-
视黄酸-11-3H(14),纯化后将其
水解为α-
视黄酸-11-3H酸(15)。转化为甲酯(16),然后
氢化铝锂还原,得到所有反式-α-
视黄醇(17),将其作为
乙酸酯衍
生物(18)分离。