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Note | Regular issue | Vol 63, No. 7, 2004, pp.1637-1643
Published online, 27th April, 2004
DOI: 10.3987/COM-04-10070
Novel Heterocycles: 4-Methyl-2H-pyrano[6,5-f]cycloalka[2,1-b]2H-chromen-2-ones

Qian Zhang, Ying Chen, Yi Xia, Zhengyu Yang, Peng Xia*

*School of Pharmacy, Fudan University, Yi Xue Yuan Road 138, Shanghai 200032, China

Abstract

A synthesis of the new heterocycles, 4-methyl-2H-pyrano[6,5- f]cycloalka[2,1-b]2H-chromen-2-ones (3) was described, via the unexpected intermediates 2-chloro-1-chloroethenylidenecycloalkanes (6) from the reaction of 1-ethynylcycloalkanols with thionyl chloride. The mechanism of some steps was discussed.