photoredox-promoted and nitrogen radical catalyzed [3 + 2] cyclization of vinylcyclopropanes and N-tosyl vinylaziridines with alkenes is developed. Key to the success of this process is the use of the readily tunable hydrazone as a nitrogen radical catalyst. Preliminary mechanism studies suggest that the photogenerated nitrogen radical undergoes reversibleradical addition to the vinylcyclopropanes
Palladium Pincer Complex Catalyzed Substitution of Vinyl Cyclopropanes, Vinyl Aziridines, and Allyl Acetates with Tetrahydroxydiboron. An Efficient Route to Functionalized Allylboronic Acids and Potassium Trifluoro(allyl)borates
作者:Sara Sebelius、Vilhelm J. Olsson、Kálmán J. Szabó
DOI:10.1021/ja052885q
日期:2005.8.1
Palladium-catalyzed boronation of vinyl cyclopropane, vinyl aziridine, and allylacetate substrates could be accomplished using tetrahydroxydiboron reagent in the presence of SeCSe pincer complex catalyst 1a. These reactions result in allyl boronic acids, which were converted to synthetically useful trifluoro(allyl)borates or allyl boronates. The catalytic transformations proceed under mild and neutral
Palladium-Catalyzed Ring-Opening Thiocarbonylation of Vinylcyclopropanes with Thiols and Carbon Monoxide
作者:Chang-Feng Li、Wen-Jing Xiao、Howard Alper
DOI:10.1021/jo801725j
日期:2009.1.16
Palladium-catalyzed ring-opening thiocarbonylation of vinylcyclopropanes (VCPs) with thiols and carbon monoxide affords the corresponding unsaturated thioesters in moderate to excellent yields. This reaction provides a general method for the ring-opening thiocarbonylation of VCPs. It further demonstrates the utility of transition metal catalysts for the synthesis of organosulfur compounds.
Ring-Opening <i>Ortho</i>-C–H Allylation of Benzoic Acids with Vinylcyclopropanes: Merging Catalytic C–H and C–C Activation Concepts
作者:Zhiyong Hu、Xiao-Qiang Hu、Guodong Zhang、Lukas J. Gooßen
DOI:10.1021/acs.orglett.9b02393
日期:2019.9.6
A Ru-catalyzed selective and atom-economic ortho-C-H allylation of aromatic acids with vinylcyclopropanes is reported. The reaction proceeds with selective cleavage of both a C-H and a C-C bond. A wide range of allylarenes were synthesized in high yields and stereoselectivities. The vinylcyclopropane substrates can optionally be generated in situ from a diazo compound and 1,3-butadiene. Concise syntheses
Visible-light-induced metal-free trifluoromethylation of activated, carbocyclic, and unactivated vinylcyclopropanes via a ring-opening reaction using the Langlois reagent (CF3SO2Na) is reported to synthesize allylic trifluoromethylated derivatives. Allylic trifluoromethylation was achieved by a photo-oxidative single electron transfer (SET) process at an ambient temperature and under metal-free conditions
据报道,使用Langlois试剂(CF 3 SO 2 Na)通过开环反应,可见光诱导的活化,碳环和非活化乙烯基环丙烷的无金属三氟甲基化反应可合成烯丙基三氟甲基化衍生物。烯丙基三氟甲基化是通过在环境温度和无金属条件下通过光氧化单电子转移(SET)工艺以及使用吡喃鎓盐作为光氧化还原催化剂的可见光照射实现的。所报道的方法具有操作简单,基材范围广,官能团耐受性高和可扩展性的特点。