Fluorinated acetylenes Part 16. The reactions of ethyl 4,4,4-trifluorobut-2-ynoate and hexafluorobut-2-yne with quadricyclane and the hydrogenation and thermal rearrangement of the resulting 1:1 cycloadducts
作者:Michael G. Barlow、Nadia N.E. Suliman、Anthony E. Tipping
DOI:10.1016/0022-1139(94)03203-c
日期:1995.7
Thermal reaction of ethyl 4,4,4-trifluorobut-2-ynoate (1) and hexafluorobut-2-yne (2) with quadricyclane (3) gave the exo-1:1 adducts (4a) and (4b), respectively, by a (σ2s+σ2s+η2s) cycloaddition pathway. Hydrogenation (1 mol equiv. of hydrogen) of adducts 4a and 4b using a catalyst resulted in addition to the least substituted double bond to afford the alkenes 5a and 5b, respectively, and further
乙基4,4,4-三氟丁-2-炔酸乙酯(的热反应1)和六氟丁-2-炔(2)与四环烷烃(3)得到外切-1:1个加合物(4A)和(4B),分别由(σ 2个小号+ σ 2小号+ η 2个小号)环加成通路。除了最少取代的双键之外,使用催化剂氢化加合物4a和4b(1摩尔当量的氢),得到烯烃5a和5b。分别进行烯烃5a的进一步氢化,得到烷烃6。加合物4a在450℃下的流热解产生顺式,顺式,顺式-3-碳乙氧基-4-三氟甲基双环[4.2.1] nona-2,4,7-三烯(7a)(30%)和约。顺式,顺式,顺式-4-碳乙氧基-3-三氟甲基双环[4.3.0] nona-2,4,7-三烯(8a)及其3-碳乙氧基-4-三氟甲基异构体(1:1的混合物(55%)(8b)。化合物7a是由加合物4a的未证实的开环产生的,化合物8a和通过7a的分子内Diels-Alder反应,然后进行涉及1,2-氢转移的重排,形成8b。在相