A General and Expedient Synthesis of 5- and 6-Membered Cyclic Carbonates by Palladium-Catalyzed Oxidative Carbonylation of 1,2- and 1,3-Diols
作者:Bartolo Gabriele、Raffaella Mancuso、Giuseppe Salerno、Lucia Veltri、Mirco Costa、Angela Dibenedetto
DOI:10.1002/cssc.201100250
日期:2011.12.16
We present a general, practical, and efficient approach to 5‐ and 6‐membered organic carbonates by palladium‐catalyzed direct oxidative carbonylation of 1,2‐ and 1,3‐diols, respectively. Reactions were carried out at 100 °C in N,N‐dimethylacetamide as the solvent under 20 atm (at 25 °C; 1 atm=101.3 kPa) of a 4:1 v/v CO/air mixture in the presence of 0.5–2 mol % of PdI2 and KI (KI/PdI2 molar ratio=10)
我们提出了一种一般,实用和有效的方法,分别通过钯催化的1,2-和1,3-二醇的五元和六元有机碳酸酯的合成。反应在100°C的N,N-二甲基乙酰胺为溶剂,在20 atm(25°C; 1 atm = 101.3 kPa)的4:1 v / v CO /空气混合物中,存在0.5– 2mol%的PdI 2和KI(KI / PdI 2摩尔比= 10)。在某些情况下,需要过量的脱水剂,例如原乙酸三甲酯,以获得明显的效果。该方法还可以用于由甘油(一种容易获得的原料)合成高附加值的碳酸甘油酯。当应用于α‐D-葡萄糖发生了双重羰基化过程,直接形成了α- D-葡萄糖呋喃糖1,2:5,6-二碳酸酯。