Rapid and Multigram Synthesis of Vinylogous Esters under Continuous Flow: An Access to Transetherification and Reverse Reaction of Vinylogous Esters
作者:Nirmala Mohanta、Moreshwar B. Chaudhari、Naveen Kumar Digrawal、Boopathy Gnanaprakasam
DOI:10.1021/acs.oprd.9b00067
日期:2019.5.17
a continuous-flow up to 40 h afforded 8.0 g of the vinylogous ester with turnover number (TON) = 28.6 and turnover frequency (TOF) = 0.715 h–1 using Amberlyst-15 as a catalyst. Furthermore, a continuous-flow sequential transetherification of vinylogous esters with various alcohols has been achieved in high yield. Reversibly, this vinylogous ester was deprotected or hydrolyzed into ketone using environmentally
在廉价的Amberlyst-15催化剂存在下,用醇类开发了一种从1,3-二酮合成乙烯基酯及其在连续流下逆反应的环境友好方法。这种方法学具有高度的选择性,对一系列环状的1,3-二羰基化合物具有通用性,在无溶剂和无金属的条件下,该文库可提供线性至烷基化和芳基化的乙烯基酯库,收率高至极佳。此外,在长达40小时的连续流中进行的长时间实验得到了8.0 g的乙烯基酯,其周转数(TON)= 28.6,周转频率(TOF)= 0.715 h –1使用Amberlyst-15作为催化剂。此外,已经以高收率实现了乙烯基酯与各种醇的连续流动顺序的醚交换。可逆地,使用环境友好的水作为溶剂,使用Amberlyst-15作为催化剂,在连续流过程中将该乙烯基酯脱保护或水解为酮。