Synthesis of a new class of bisheterocycles via the Heck reaction of eudesmane type methylene lactones with 8-bromoxanthines
作者:Sergey S. Patrushev、Tatyana V. Rybalova、Igor D. Ivanov、Valentin A. Vavilin、Elvira E. Shults
DOI:10.1016/j.tet.2017.03.016
日期:2017.5
8-bromo-9-butyltheophylline) under Heck reaction conditions to produce the target (E)-13-(2,6-dioxo-2,3-dihydro-1H-purin-8-yl)eudesma-4(15),11(13)-dien-8β,12-olides and the subsequent endocyclic isomers - 11-(2,6-dioxo-2,3-dihydro-1H-purin-8-yl)-13-normethyleudecma-4(15)-7(11)-dien-8α,12-olides. It was revealed that the yield and product ratio depends on the reaction conditions and the structure of methylene
eudesmane型亚甲基内酯(异戊内酯,丙内酯,4,15-环氧异丙内酯,2',2'-dichloro-4 H-螺[环丙烷-1',4-eudesma-11(13)-en-8β,12-乙交酯]和丙二酸内酯)在Heck反应条件下与8-溴黄嘌呤(8-溴咖啡因,8-溴可可碱,8-溴-3-丁基可可碱,8-溴可可碱,8-溴-9-可可碱)反应生成目标(E)-13-(2,6-dioxo-2,3-dihydro-1 H -purin-8-yl)eudesma-4(15),11(13)-dien-8β,12-olides和随后的环内异构体-11-(2,6-二氧-2,3-二氢-1 H-purin-8-yl)-13-normethyleudecma-4(15)-7(11)-dien-8α,12-olides。结果表明,产率和产物比取决于反应条件和亚甲基内酯的结构。在该反应中已证明了Pd(OAc)2-咖啡因催化体系