Synthesis of spiro[2<i>H</i>-indole-2,1′-1<i>H</i>-isoindole]-3,3′-diones, spiro[1<i>H</i>-isobenzofuran-1,2′-2<i>H</i>-indole]-3,3′-diones and spiro[benzofuran-2,1′-isobenzofuran]-3,3′-diones<i>via</i>transannular reactions of eight membered ring intermediates
作者:James L. Bullington、John H. Dodd
DOI:10.1002/jhet.5570350223
日期:1998.3
product 4 was isolated from a high dilution reaction of ninhydrin with 3,4,5-trimethoxyaniline in water. A general synthesis of this compound and its derivatives 4–6 was devised by oxidation of tetrahydroindeno[1,2-b]indol-10-ones 1–3 with sodium periodate to give isoindolo[2,1-a]-indole-6,11-diones 4–6 in good yield. Compounds 4–6 can be easily transformed into spiro[1H-isobenzofuran-1,2′-2H-indole]-3,3′-diones
从茚三酮与3,4,5-三甲氧基苯胺在水中的高稀释反应中分离出自动氧化重排产物4。通过用高碘酸钠氧化四氢茚并[1,2 - b ]吲哚-10-酮1-3,制得该化合物及其衍生物4-6的一般合成方法,得到异吲哚并[ 2,1- a ]-吲哚-6 ,11-二酮4–6的产率很高。化合物4–6可以轻松转化为螺[1 H-异苯并呋喃-1,2'- 2 H-吲哚] -3,3'-二酮8-10,螺[2 H-吲哚-2,1'-1 [H -isoindole] -3,3'-diones 11-13和高产率的异吲哚[1,2- a:2',1' - b ]嘧啶-5,15-二酮15、16。对3-氨基-5a,10a-二羟基苯并[ b ]茚并[2,1 - d ]呋喃-10-酮(17)进行类似反应,得到二苯并辛三酮18,螺-[苯并呋喃-2,1'-异苯并呋喃。 ] -3,3'-二酮19和异吲哚-1-酮20。