Tandem ring-opening and formal [3 + 2] cycloaddition of furo[2,3-<i>d</i>]pyrimidine-2,4-diones
作者:Li Huang、Ying Han、Jing Sun、Qiu Sun、Chao-Guo Yan
DOI:10.1039/d3ob00769c
日期:——
The base promoted tandem annulation reaction of activated cyclic 1,3-dipolarophiles such as 2-arylidene-1,3-indanediones, 2-(o-hydroxybenzylidene)-1,3-indanediones and 3-methyleneoxindoles with functionalized furo[2,3-d]pyrimidine-2,4-diones was systematically investigated. This reaction provided efficient synthetic protocols for complex dispiro/dispiro fused tricyclic compounds including dispiro[indene-2
该碱促进了活化的环状1,3-偶极亲和物(例如2-亚芳基-1,3-茚满二酮、2-(邻羟基亚苄基)-1,3-茚满二酮和3-亚甲基氧吲哚与官能化呋喃的串联环化反应[2,3]对-d ]嘧啶-2,4-二酮进行了系统研究。该反应为复杂的二螺/二螺稠合三环化合物提供了有效的合成方案,包括二螺[茚-2,3'-环戊烷-1',5''-嘧啶]、二螺[二氢吲哚-3,3'-环戊烷-1'、 5''-嘧啶]和螺[环戊[ c ]茚并[1,2- b ]色烯-3,5'-嘧啶]的产率良好,并且具有高非对映选择性。据信该反应是通过呋喃基环的连续开环、正式的[3+2]环加成和邻羟基苯基的环化进行的。