Synthesis of 3-methyl- and 3,4-dimethylfurans using alkoxide, thiolate, and phenoxide-mediated cyclization of 4-oxahepta-1,6-diynes bearing sulfur and selenium functional groups
作者:Nami Takahashi、Yuya Nagase、Genzoh Tanabe、Osamu Muraoka、Mitsuhiro Yoshimatsu
DOI:10.1016/j.tet.2011.11.096
日期:2012.2
We have reported sodium alkoxide- or aryloxide-mediated cyclization of 4-oxahepta-1,6-diynes bearing the phenylsulfanyl group 1a-d. The reactions with diverse sodium alkoxides and aryloxide produced 4-alkoxymethyl- and 4-aryloxymethylfurans 2aa-2db in good to high yields. Although reactions with sodium benzenethiolate yielded 3,4-bis(phenylsulfanylmethyl)furans 5a-g, they readily desulfanylated in the presence of tributyltin hydride/AIBN to give the 3-methyl- and 3,4-dimethylfuran derivatives 6a-g. This method's utility was demonstrated by the synthesis of tetrahydronaphthalenyl furan derivatives bearing alkoxy- and aryloxymethyl substituents. (C) 2011 Elsevier Ltd. All rights reserved.