Fluorinated acetylenes. Part 15. The reaction of ethyl 4,4,4-trifluorobut-2-ynoate with dienes and cycloheptatriene
作者:Michael G. Barlow、Nadia N.E. Suliman、Anthony E. Tipping
DOI:10.1016/0022-1139(94)03103-7
日期:1995.1
reaction of the acetylenic ester CF3CCCO2Et (1) with cyclopentadiene (4), buta-1,3-diene (5) and 1,4-diphenylbuta-1,3-diene (6) gave the corresponding Diels-Alder 1:1 cycloadducts 10, 11 and 12, respectively in high yield (73%–97%). With norbornadiene (7), the homo Diels-Alder adduct (13) was formed. The reaction with 3-carboethoxyfuran gave a mixture (55%) of the isomeric Diels-Alder 1:1 adducts 14
炔酯CF的热反应3 CCCO 2的Et(1与环戊二烯()4),丁-1,3-二烯(5)和1,4- diphenylbuta -1,3-二烯(6),得到相应的狄尔斯-阿尔德1:1 cycloadducts 10,11和12,分别以高收率(73%-97%)。与降冰片二烯(7)一起,形成均相的Diels-Alder加合物(13)。与3-羰基乙氧基呋喃的反应得到异构体Diels-Alder 1:1加合物14和15(比率55:45)以及四个2:1加合物的混合物(55%),即exo,endo化合物16a(10%)和16b(9%)以及exo,exo化合物17a(8%)和17b(9%),是由于呋喃与1:1中最少取代的双键的Diels-Alder环加成而产生的加合物14和15。1:1加合物的环加成是区域选择性的,参与该环加成的不饱和键上的两个CO 2 Et基团在2:1加合物中彼此为1,4。酯1与环庚三烯(9