A highly diastereoselective three-component inverse-electron-demand aza DielsâAlder reaction assisted by per(poly)fluoro-alkanesulfinamides is presented, providing a broad spectrum of highly functionalized piperidine derivatives with excellent endo/exo and facial diastereoselectivities. The electron-withdrawing perfluoroalkyl groups are crucial for the success of this reaction under mild conditions and facilitate monitoring the process and stereoselectivities of the reaction. The synthetic potential of these cycloadducts is also highlighted.
Diastereoselectivity-switchable and regiospecific hetero Diels–Alder reaction of N-sulfinylper(poly)fluoroalkanesulfinamides with dienes
作者:Xiao-Jin Wang、Jin-Tao Liu
DOI:10.1016/j.tet.2005.05.022
日期:2005.7
reacted readily with dienes in methylene chloride at −78 °C to give the corresponding cycloadducts with complete regioselectivities and good diastereoselectivities. The diastereoselectivity of the reaction was switchable to the opposite under the catalysis of Lewis acids such as TiCl4 and SnCl4.
Synthesis and Identification of Solution-Stable Sulfenic Acids: Perfluoroalkanesulfenic Acids
作者:Xiao-Bo Li、Ze-Feng Xu、Li-Juan Liu、Jin-Tao Liu
DOI:10.1002/ejoc.201301563
日期:2014.2
electron-withdrawing effect of perfluoroalkyl groups, solution-stableperfluoroalkanesulfenicacids were synthesized for the first time by Cope-type elimination of the corresponding imines; the acids were identified by 1H NMR, 19F NMR, and IR spectroscopy and mass spectrometry. Trapping reagents were utilized to capture the in situ generated sulfenicacids, which provided further experimental evidence for
Synthesis of γ-Lactams via Pd(II)-Catalyzed C(sp<sup>3</sup>)–H Olefination Using a Self-Cleaving Polyfluoroethylsulfinyl Directing Group
作者:Nan-Qi Shao、Yu-Hao Chen、Chen Li、Dong-Hui Wang
DOI:10.1021/acs.orglett.0c00326
日期:2020.9.18
A monodentate directinggroup, 2-chlorotetrafluoroethylsulfinylmide (-NHSOCF2CF2Cl), for inert C(sp3)–H bond activation is reported. This directinggroup shows efficient ability in Pd(II)-catalyzed C(sp3)–H olefination. The desired olefination products undergo subsequent Michael addition and in situ expulsion of the auxiliary to provide the free NH γ-lactam products. Preliminary mechanistic studies
Synthesis of N–H-Free 1,4-Dihydroisoquinoline-3(2<i>H</i>)-ones via Pd-Catalyzed C–H Olefination Using Polyfluorosulfinyl as the Auxiliary Group
作者:Yu-Hao Chen、Nan-Qi Shao、Chen Li、Dong-Hui Wang
DOI:10.1021/acs.orglett.0c01979
日期:2020.8.7
Pd(II)-catalyzed olefination of aryl C–H bonds with a self-cleaving 2-chlorotretafluoroethylsulfinyl (−SOCF2CF2Cl) auxiliary was developed. In the reaction mixture, the olefination products underwent in situ Michael addition and the subsequent expulsion of the auxiliary to provide the N–H-free 1,4-dihydroisoquinoline-3(2H)-one products. Mechanistic studies reveal that the auxiliary group is crucial for C–H activation
开发了具有自裂解2-氯四氟乙基亚磺酰基(-SOCF 2 CF 2 Cl)助剂的Pd(II)催化的芳基CH键的烯化。在反应混合物中,将烯烃化产物进行原位迈克尔加成反应,随后将助剂逐出,以提供不含NH的1,4-二氢异喹啉-3(2 H)-一产物。机理研究表明,辅助基团对于C–H活化至关重要,并且Na 2 CO 3和一种醇溶剂在促进多氟烷基亚磺酰基辅助剂的裂解中起关键作用。