Synthesis 2011(17): 2803-2809  
DOI: 10.1055/s-0030-1260131
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Iron(II) Chloride Catalyzed Alkylation of Propargyl Ethers: Direct Functionalization of an sp³ C-H Bond Adjacent to Oxygen

Yongju Xiea, Ming Yua, Yuhong Zhang*a,b
a Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. of China
Fax: +86(571)87953244; e-Mail: yhzhang@ zju.edu.cn;
b State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. of China
Further Information

Publication History

Received 10 May 2011
Publication Date:
21 July 2011 (online)

Abstract

Iron(II) chloride catalyzed direct alkylation of sp³ C-H bond adjacent to oxygen in propargyl ethers has been accomplished by the use of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as oxidant under mild reaction conditions. The reaction proceeded smoothly with a variety of 1,3-diketones leading to β-dicarbonyl ether in moderate yields. In the absence of 1,3-diketones, ynenones were produced by the use of iron(III) chloride and DDQ.