organophotoredox catalysts that operate under irradiation with green light have been developed. These catalysts present high excited-state reduction potentials (E0′(C∗/C−) = +1.79–1.94 V vs SCE). They are able to efficiently activate dienophiles under green or blue light irradiation afforded the targeted radicalcation Diels-Alder cycloadducts in good yields. The present thioxanthylium-based catalysts provide
已经开发了在绿光照射下操作的基于硫杂蒽鎓的有机光还原催化剂。这些催化剂具有较高的激发态还原电位(E 0 '(C ∗ / C -)= + 1.79–1.94 V vs SCE)。它们能够在绿光或蓝光辐射下有效活化亲二烯体,从而以高收率获得了目标自由基阳离子Diels-Alder环加合物。本发明的基于噻吨鎓的催化剂提供了新的绿光驱动的光氧化还原催化体系。
Electronically Mismatched Cycloaddition Reactions via First-Row Transition Metal, Iron(III)–Polypyridyl Complex
作者:Jung Ha Shin、Eun Young Seong、Hyeon Jin Mun、Yu Jeong Jang、Eun Joo Kang
DOI:10.1021/acs.orglett.8b02541
日期:2018.9.21
one-electron oxidant, producing radicalcations from olefins and promoting the efficient radicalcation [2 + 2] and [2 + 4] cycloaddition reactions. Subsequent chain propagation afforded trisubstituted cyclobutane or cyclohexene derivatives, and this facile route enables the replacement of rare metals with sustainable, green, and inexpensive iron in radicalcationcycloadditions.
Photooxidizing Chromium Catalysts for Promoting Radical Cation Cycloadditions
作者:Susan M. Stevenson、Matthew P. Shores、Eric M. Ferreira
DOI:10.1002/anie.201501220
日期:2015.5.26
The photooxidizing capabilities of selected CrIII complexes for promotingradicalcationcycloadditions are described. These complexes have sufficiently long‐lived excited states to oxidize electron‐rich alkenes, thereby initiating [4+2] processes. These metal species augment the spectrum of catalysts explored in photoredox systems, as they feature unique properties that can result in differential
Cycloaddition Reactions of Alkene Radical Cations using Iron(III)‐Phenanthroline Complex
作者:Yong Hyun Cho、Jae Hyung Kim、Hyeju An、Kwang‐Hyun Ahn、Eun Joo Kang
DOI:10.1002/adsc.202000191
日期:2020.5.26
oxidation of electron‐rich alkenes using the iron(III)‐phenanthroline complex produced electrophilic alkene radical cations, which promoted efficient radical cation [2+1] cycloaddition reactions with diazo compounds. Subsequent chain propagation afforded tri‐ and tetra‐substituted cyclopropanes. This methodology was also expanded to [3+2] cycloaddition reactions with vinyl diazoesters, validating this sustainable