route to the concave-shaped, potentially ionophoric syn- and anti-isomers of 5,6,11,12,17,18-hexahydro-5,18:6,11:12,17-triepoxytrinaphthylene (4) was elaborated. Starting from ‘oxabenzonorbornadiene’ (5), the stannylated precursor 9 was prepared in three steps, followed by cyclotrimerization catalyzed by copper(I) thiophene-2-carboxylate (CuTC) , which afforded 4 in a syn/anti ratio of 5 : 4.
一种有效的合成途径为5,6,11,12,17,18,hexahydro-5,18:6,11:12,17-
三环氧三
萘并
四氢呋喃的凹形,可能具有离子性的顺式和反式异构体(4)是详细说明。从“oxabenzonorbornadiene”(起始5),则stannylated前体9的三个步骤来制备,随后环化三聚由
铜催化的(I)
噻吩-2-羧酸甲酯(CUTC),得到了4在顺/反比为5:4 。