Contra-steric Diels-Alder route to 3-oxodicyclopentadiene and meso 3,5-endo-dihydroxy-4,5-dihydrodicyclopentadiene
作者:Tsutomu Sugahara、Kunio Ogasawara
DOI:10.1016/0040-4039(95)02129-9
日期:1996.1
Diels-Alder reaction between cyclopentadiene and 4-tert-butoxycyclopentenone occurs in a contra-steric manner to give more hindered endo-3-tert-butoxydicyclopentadiene as the major product (∼15:1) in excellent yield. The product has been transformed into either (±)- and (−)-3-oxodicyclopentadiene or meso 3,5-endo-dihydroxy-4,5-dihydrodicyclopentadiene efficiently.
环戊二烯和4-之间的Diels-Alder反应叔-butoxycyclopentenone发生在一个抵消空间的方式,得到多种受阻内-3-叔-butoxydicyclopentadiene作为主要产物(〜15:1)的优良率。该产物已经有效地转化为(±)-和(-)-3-氧二环戊二烯或内消旋3,5-内-二羟基-4,5-二氢二环戊二烯。