Ionic liquids accelerating cycloaddition between 1-aryl-2-halocyclopropenes and furan
作者:May-Fan Ding、Shaw-Tao Lin、Woan-Ju Chang
DOI:10.3998/ark.5550190.0011.219
日期:——
with furan in a RTIL to give a fair good yield of the [4+2]-cycloadducts with more than 90% of the exo-isomer. The imidazolium type ionicliquids are able to accelerate this cycloaddition process with high steric selectivity. Neither pyrrole nor thiophene undergoes the cycloaddition with cyclopropene to form the [4+2]-cycloadduct. 1-Aryl-3,3-difluoro-2-halocyclopropenes are inert towards furan even
Stereo- and Regioselective 1,3-Dipolar Cycloaddition of the Stable Ninhydrin-Derived Azomethine Ylide to Cyclopropenes: Trapping of Unstable Cyclopropene Dipolarophiles
作者:Alexander S. Filatov、Siqi Wang、Olesya V. Khoroshilova、Stanislav V. Lozovskiy、Anna G. Larina、Vitali M. Boitsov、Alexander V. Stepakov
DOI:10.1021/acs.joc.9b00753
日期:2019.6.7
den-3-olate, DHPO] to differently substituted cyclopropenes has been established. As a result, an efficient synthetic protocol was developed for the preparation of biologically relevant spiro[cyclopropa[a]pyrrolizine-2,2′-indene] derivatives. DHPO has proved to be an effective trap for such highly reactive and unstable substrates as parent cyclopropene, 1-methylcyclopropene, 1-phenylcyclopropene, and
稳定的茚三酮衍生的甲亚胺叶立德[2-(3,4-dihydro-2 H-吡咯鎓-1-基)-1-oxo-1 H -inden-3-的立体和区域选择性1,3-偶极环加成反应已经确定了不同的取代的环丙烯的油酸酯,DHPO]。结果,开发了一种有效的合成规程,用于制备生物学相关的螺环[环丙烷] [ a]]吡咯嗪-2,2'-茚]衍生物。事实证明,DHPO可有效捕获高反应性和不稳定的底物,如母体环丙烯,1-甲基环丙烯,1-苯基环丙烯和1-卤-2-苯基环丙烯。还发现3-硝基-1,2-二苯基环丙烯在醇和硫醇中进行亲核取代反应,得到3-烷氧基-和3-芳硫基取代的1,2-二苯基环丙烯,可以将其捕获为相应的1,在DHPO存在下的3-偶极环加合物。这些新方法为合成功能取代的环丙烷[ a]提供了直接的策略。]吡咯嗪衍生物。已经通过量子力学计算(M11密度泛函理论)揭示了控制区域选择性和立体选择性的因素,包括先前未报道的N
Synthesis of bridging vinylideneiron dimers using 1,1-dichlorocyclopropanes. Cyclopropenes as intermediates
作者:David F. Marten、Eckehard V. Dehmlow、David J. Hanlon、M. Bilayet Hossain、Dick Van der Helm
DOI:10.1021/ja00406a045
日期:1981.8
MARTEN D. F.; DEHMLOW E. V.; HANLON D. J.; HOSSAIN M. B.; HELM D. VAN DER, J. AMER. CHEM. SOC., 1981, 103, NO 16, 4940-4941
作者:MARTEN D. F.、 DEHMLOW E. V.、 HANLON D. J.、 HOSSAIN M. B.、 HELM D. VAN DER