One pot synthesis of polycyclic oxygen aromatics. Part IV reaction of THP ether of 2-bromomethyl phenols
作者:Tirumalai R. Kasturi、Asish B. Mandal、Bangalore G. Sumana、Betagiri Rajasekhar
DOI:10.1016/s0040-4020(01)86351-1
日期:1993.3
Reaction of 2-bromomethyl-1-(2′-tetrahydropyranyloxy) benzene 3a with tetrachlorocatechol(TCC) in acetone in presence of anhydrous K2CO3 resulted in the formation of diastereomeric products to which cis- & trans- 6-chloro-8-hydroxy-8-(2-oxopropyl)spiro[9H-benzo[a]xanthen- 9,2′(1′H) benzofuran]-7(8H)-one (7a & 8a) structures were assigned, along with tetrachlorocatechol ethers (5a & 6a). Similar reaction
在无水K 2 CO 3存在下,2-溴甲基-1-(2'-四氢吡喃氧基)苯3a与四氯邻苯二酚(TCC)在丙酮中的反应导致形成非对映异构产物,顺式和反式-6-氯-8羟基-8-(2-氧代丙基)螺[9 ħ -苯并[一个] xanthen- 9,2' - (1' ħ)苯并呋喃] -7-(8 ħ) -酮(7a中及8a中被分配)的结构,沿用四氯邻苯二酚醚(5a和6a)。3a与四溴邻苯二酚(TBC)的相似反应)得到预期的一溴化合物7d和8d以及醚5d和6d。当在酮溶剂(丙酮/甲乙酮)中用TCC / TBC与底物3b–c重复反应时,相应的化合物5b–c至8b–c,5e–f至6e–f,7e–g和8e–获得了h。对于该反应中丙酮基化合物6的形成给出了适当的解释。