Enynylation of 2-Iodo-4-(phenylchalcogenyl)-1-butenes via Intramolecular Chelation: Approach to the Synthesis of Conjugated Dienynes or Trienynes
作者:Min Shi、Le-Ping Liu、Jie Tang
DOI:10.1021/ol051101a
日期:2005.7.1
[reaction: see text] 2-Iodo-4-(phenylchalcogenyl)-1-butenes 3 and 4, which are derived from methylenecyclopropanes 1, can be enynylated with alkynes catalyzed by Pd(OAc)(2) to give conjugateddienynes 5 and 6 in the absence of any phosphine ligand and copper salt, and trienyne 9a can be obtained by oxidation of compound 5a. A plausible reaction mechanism has been proposed.
C(sp3)-C(sp3) Bond Breaking in Methylenecyclopropanes Involving a AuI/AuIII Catalytic Cycle
作者:Di-Han Zhang、Lun-Zhi Dai、Min Shi
DOI:10.1002/ejoc.201000765
日期:——
Gold(I) can catalyze the diacetoxylation of methylenecyclopropanes to produce the corresponding diacetoxylated products in moderate to good yields in acetic acid in the presence of iodosobenzene diacetate via C-C bondbreaking under mild condition
Gold(I) 可以在二乙酸碘苯酯的存在下,在温和条件下通过 CC 键断裂,催化亚甲基环丙烷的二乙酰氧基化反应,以中等至良好的产率在乙酸中生成相应的二乙酰氧基化产物
<i>N</i>-Bromosuccinimide and Lithium Bromide: An Efficient Combination for the Dibromination of Carbon-Carbon Unsaturated Bonds
作者:Min Shi、Li-Xiong Shao
DOI:10.1055/s-2006-941558
日期:——
Compounds possessing unsaturated bonds such as alkenes, alkynes, allenes, and methylenecyclopropanes (MCPs) can be dibrominated within minutes by NBS and lithium bromide in THF at room temperature in good to excellent yields under mild conditions.
arylation reaction using α-aryl isopropenyl-tert-cyclobutanols has been developed. This reaction gives access to benzodiquinanes in moderate to good yields and tolerates alkyl-, alkoxy-, and halogen-substitutedaryl groups.
Synthesis of 2‐Benzyl‐3,4‐dihydronaphthalenes via Oxidative Radical Opening/Cyclization of Methylenecyclopropanes with Potassium Benzyltrifluoroborates
Here reports a copper-catalyzed approach for the synthesis of 2-benzyl-3,4-dihydronaphthalenes. The reaction was proposed to proceed by a sequence of radical addition, ring-opening, and cyclization of methylenecyclopropanes with potassium benzyltrifluoroborate. Such a method features operational simplicity, mild reaction conditions and widely functional group tolerance and accords a diverse array of