Synthesis of 4H,5H-pyrano [3,2-c] (1) benzopyran-4,5-diones

被引：0
|
作者：
Bhagat, RD [1 ]
Mulwad, VV [1 ]
机构：
[1] Inst Sci, Dept Chem, Bombay 400032, Maharashtra, India
来源：
INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY | 1999年 / 9卷 / 02期
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D O I：
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中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
Claisen condensation of 3-acetyl-4-hydroxycoumarins with different esters in the presence of sodium/ether gave 4-hydroxy 3[1 -substituted-1,3-dioxo propyl] benzopyran-2-ones (IIa-p) which on further cyclization with sodium acetate and acetic acid gave corresponding 4H, 5H-pyrano [3,2-c](1) benzopyran-4,5-diones (IIIa-p). Alternate route for the synthesis of 7-methyl-4-hydroxy 3 [1-phenyl-1,3-dioxo prspyl] benzopyran-2-one (IIg) is also suggested.
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页码：123 / 126
页数：4
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