A convenient route to alkylidenecyclopropanes from cyclopropyldiphenylphosphine oxide and carbonyl compounds
作者:Gordon F. Meijs、Peter C.H. Eichinger
DOI:10.1016/s0040-4039(00)96780-7
日期:1987.1
Alkylidenecyclopropanes were readily prepared by thermal decomposition of the potassium or lithium salt of the adduct formed from the treatment of cyclopropyldiphenylphosphine oxide with -butyl lithium and a carbonyl compound.
Strain-Promoted Oxidation of Methylenecyclopropane Derivatives using <i>N</i>-Hydroxyphthalimide and Molecular Oxygen in the Dark
作者:T. E. Anderson、K. A. Woerpel
DOI:10.1021/acs.orglett.0c02075
日期:2020.7.17
The hydroperoxidation of alkylidenecyclopropanes and other strained alkenes using an N-hydroxylamine and molecular oxygen occurred in the absence of catalyst, initiator, or light. The oxidation reaction proceeds through a radical pathway that is initiated by autoxidation of the alkene substrate. The hydroperoxides were converted to their corresponding alcohols and ketones under mild conditions.
Methylenecyclopropanes (MCP) undergo ring opening reactions with group I and II metal halides and ammonium halides in liquid SO2 to afford homoallylic halides, which are versatile reagents in organic synthesis. The developed reaction conditions are compatible with acid-labile substrates such as N-Boc-protected compounds. Liquid SO2 is a polar reaction medium with Lewisacid properties that solubilizes
亚甲基环丙烷(MCP)与第一和第二族金属卤化物和卤化铵在液体SO 2中进行开环反应,得到均烯丙基卤化物,它们是有机合成中的通用试剂。所开发的反应条件与酸不稳定的底物如N -Boc保护的化合物相容。液体SO 2是具有路易斯酸性质的极性反应介质,可溶解无机盐。通过对照实验证明了SO 2的独特性质:1)在常规溶剂中与上述盐进行反应后,在催化量的H 3 PO 4(相似的pK)存在下也未观察到MCP开环a等于H 2 SO 3),或不存在H 3 PO 4;2)SO 2在THF中的溶液表现出与液体SO 2相似的性质。
Palladium-catalyzed hydroalkylation of methylenecyclopropanes with simple hydrazones
作者:Jinzhong Yao、Zhangpei Chen、Lin Yu、Leiyang Lv、Dawei Cao、Chao-Jun Li
DOI:10.1039/d0sc01221a
日期:——
A palladium-catalyzed hydroalkylation reaction of methylenecyclopropanes via highly selective C–C σ-bond scission was achieved under mild conditions, in which simple hydrazones served as carbanion equivalents. This method featured good functional group compatibility, affording high yields of C-alkylated terminal alkenes.
Ring-Opening Reactions of MCPs with Sulfonamides Promoted by Metal Triflate Lewis Acids
作者:Yu Chen、Min Shi
DOI:10.1021/jo035233y
日期:2004.1.1
sulfonamides gives the corresponding pyrrolidine derivatives under the same conditions. Through deuterium-labeling experiments, we found that the reaction process is involved with the rearrangement of a cyclopropylcarbinyl cation and a nonclassic carboniumion.