Synthesis 2006(4): 609-614  
DOI: 10.1055/s-2006-926298
PAPER
© Georg Thieme Verlag Stuttgart · New York

Ceric(IV)-Mediated Reaction of Methylenecyclopropanes in Organic Synthesis: A Facile Access to Dihydrofurans and Cyclobutanones

Wanli Chena, Xian Huang*a,b, Hongwei Zhoua, Lianjun Rena
a Department of Chemistry, Zhejiang University (Campus Xixi), Hangzhou 310028, P. R. of China
b State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. of China
e-Mail: huangx@mail.hz.zj.cn;
Further Information

Publication History

Received 13 July 2005
Publication Date:
11 January 2006 (online)

Abstract

Alkylidenecyclopropanes undergo CAN-mediated addition reactions with 1,3-dicarbonyl compounds or ring rearrangement reactions leading to dihydrofuran and cyclobutanone derivatives, respectively, in moderate yields.

7

X-ray crystal data for compound 3a: C22H20O2, MW = 316.38, Monoclinic, space group P21/n, a = 9.9482 (12), b = 12.0846 (14), c = 13.6979 (16) Å, α = 90, β = 99.745 (2), γ = 90, V = 1623.0(3) Å3, T = 293 (2) K, Z = 4, ρcalcd = 1.295 Mg/m3, µ = 0.081 mm-1, λ = 0.71073 Å, F(000) 672.00, independent reflections (R int = 0.0794), 9396 reflections collected; refinement method, full-matrix least-squares refinement on F2; Goodness-of-fit on F2 = 0.907; Final R indices [I > 2σ(I)] R1 = 0.0470, wR2 = 0.0913.

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MCPs 1 are not very soluble in CH3CN, therefore the co-solvent THF is required.

12

Due to the poor solubility of MCPs in H2O, we added THF as the co-solvent (THF-H2O, 4:1).