Stereoselective Synthesis of 2-(4-Hydroxyphenyl)-3-hydroxymethyl-1,4-benzodioxane-6-aldehyde—The Key Intermediate of Sinaiticin

2-(4-Hydroxyphenyl)-3-hydroxymethyl-1,4-benzodioxane-6-aldehyde 8,the key intermediate of sinaiticin 10,was synthesized in 6 step from caffeic acid 4 and 4- hydroxybenzsaldehyde 1.the coupling reaction is the key step.

Synthesis and Crystal Structure of (R)-4-Hydroxymethyl-2-thioxo Thiazolidine and Its Asymmetric Catalysis

（R）-4-Hydroxymethyl-2-thioxo thiazolidine as a new chiral catalyst in the asymmetric addition of diethylzinc to benzaldehyde was synthesized from （R）-4-hydroxymethyl-2-thioxo thiazolidine carboxylic acid and its crystal structure was determined by X-ray diffraction method. The compound was crystallized in the orthorhombic system, space group P212121 with unit cell dimensions a=0.67253（12） nm; b=0.89164（17） nm; c=1.06146（19） nm, volume 0.6365（2） nm^3; Z=4, calculated denisity 1.557 Mg/m^3; absorption coefficient 0.733 mm^-1; F（000）=312. The X-ray crystal structure analysis reveals that the compound has a thione group.

壬基酚聚氧乙烯醚双子表面活性剂的合成

以壬基酚、多聚甲醛和环氧乙烷为原料,经3步反应合成了壬基酚聚氧乙烯醚双子表面活性剂(GNP-10),对比了不同固体超强酸催化剂对第二步反应的催化性能。考察了反应条件对2-羟甲基-4-壬基苯酚(化合物Ⅰ)和二-(2-羟基-5-壬基苯基)-甲烷(化合物Ⅱ)的转化率和收率的影响,并对化合物Ⅰ、化合物Ⅱ及 GNP-10的结构进行了表征。实验结果表明,合成GNP-10的适宜条件为:第一步,以氢氧化钠为催化剂、n(壬基酚):n(多聚甲醛)=1:1、反应温度40℃、反应时间12 h、pH 为9,此时壬基酚的转化率为63.1%,化合物Ⅰ的收率为40.2%;第二步,以 SO_4^(2-)/TiO_2固体超强酸为催化剂、n(化合物Ⅰ):n(壬基酚)=1:1、反应温度110℃、反应时间6 h,此时化合物Ⅰ的转化率和化合物Ⅱ的收率分别为73.7%和69.8%;第三步,n(化合物Ⅱ):n(环氧乙烷)=1:20,120～150℃,氢氧化钠催化下反应2 h,GNP-10的收率为98.0%。3步反应的总收率为27.5%。