Metal-Free Ring Expansions of Methylenecyclopropanes Through Nitrene Equivalent
作者:Di-Han Zhang、Yin Wei、Min Shi
DOI:10.1002/ejoc.201100629
日期:2011.7.19
An interesting nitrene equivalent mediated metal-free ring expansion of methylenecyclopropanes was developed in the presence of iodosobenzenediacetate (PIDA) and 3-amino-2-ethyl-4(3H)-quinazolinone under mild conditions. A variety of cyclobutylidene hydrazine derivatives were obtained in moderate to excellent yields as separable (Z)/(E) isomeric mixtures.
Palladium(0)-Catalyzed Reaction of Cyclopropylidenecycloalkanes with Carbon Dioxide
作者:Kai Chen、Min Jiang、Zhen Zhang、Yin Wei、Min Shi
DOI:10.1002/ejoc.201101192
日期:2011.12
Cyclopropylidenecycloalkanes, which are highly strained methylenecyclopropane (MCPs) containing a cycloalkane moiety, react with carbondioxide smoothly to give the corresponding five-memberedlactone derivatives in moderate to good yields through a cyclopropane ring-opening process in the presence of Pd0 catalyst and PCy3 upon heating under 40 atm of CO2. The relative configuration of the major diastereomers
环亚丙基环烷烃是含有环烷烃部分的高度紧张的亚甲基环丙烷 (MCP),在 PdO 催化剂和 PCy3 存在下,通过环丙烷开环过程与二氧化碳顺利反应,以中等至良好的收率得到相应的五元内酯衍生物。在 40 个大气压的 CO2 下加热。主要非对映异构体的相对构型已经确定,并且还提出了合理的反应机制。
Gold(I)-Catalyzed Tandem C−H and C−C Activation (Cleavage)
作者:Min Jiang、Le-Ping Liu、Min Shi、Yuxue Li
DOI:10.1021/ol902593f
日期:2010.1.1
(Cyclopropylidenecyclohexyl)benzene derivatives, a kind of methylenecyclopropane (MCP) containing a cyclohexyl group, can undergo an interesting tandem intramolecular C−H and C−C bond activation through dehydrogenated rearrangement in the presence of AuPPh3Cl/AgOTf by transferring three hydrogen atoms from cyclohexane to cyclopropane, affording the corresponding biaryl derivatives in moderate to good
Palladium Acetate Catalyzed Oxidative Aromatization of Methylenecyclopropanes
作者:Min Jiang、Yin Wei、Min Shi
DOI:10.1002/ejoc.201000299
日期:2010.6
Isopropenylbiaryl derivatives were produced in moderate to good yields at high temperature from the reaction of methylenecyclopropanes (MCPs) 1 in the presence of palladiumacetate under ambient atmosphere by tandem intramolecular C-H and C-C bond activation and aromatization through dehydrogenated rearrangement of MCPs 1. A plausible mechanism has been proposed on the basis of deuterium labeling and