作者:Rainer Münstedt、Ulrich Wannagat
DOI:10.1016/0022-328x(87)85019-2
日期:1987.3
Synthesis of sila-vitamin A was achieved for the first time by treating sila-β-ionone in five steps; (i) with P-cyanomethyl-diethylphosphonate/NaH (Horner/Wittig reaction), (ii) reduction with diisobutylaluminum hydride, (iii) condensation with the ethyl ester of 3,3-dimethylacrylic acid/KNH2/liquid NH3 (Knoevenagel condensation), (iv) hydrolysis (KOH) and finally, (v) LiAlH4-reduction (Sumitomo process)
通过五个步骤处理sila-β-紫罗兰酮,首次实现了sila-维生素A的合成。(i)与P氰甲基膦酸二乙酯/将NaH(霍纳/ Wittig反应),(ⅱ)还原与二异丁基氢化,(ⅲ)缩合的3,3-二甲基丙烯酸乙酯/ KNH 2 /液体NH 3(诺文葛耳(iv)水解(KOH),最后(v)LiAlH 4还原(住友工艺)。根据以三甲基硅环己酮(I)为起始原料的无硅体系中的经验,尝试合成二氧化硅-维生素A(Attenburrows概念)仅导致了1-(1,1,3-三甲基-1-sila- 2-cyclohexen-2-yl)-3-methyl-1,3,5-octatrien-2-one(“ sila-C 18-酮”,并再次从sila-β-紫罗兰酮开始,分离(1-(1,1,3-三甲基-1-sila-2-环己烯-2-基)-3,7-二甲基-9-甲氧基-1,3,5,7-壬酸酯-9-一(“ sila-维生素A酸”的甲酯