Studies on the esterifications of 9-(hydroxyimino)-4-methyl-8,9-dihydrofuro[2,3-h]chromen-2-one with acid chlorides under different conditions
Studies on the esterifications of 9-(hydroxyimino)-4-methyl-8,9-dihydrofuro[2,3-h]chromen-2-one with acid chlorides under different conditions
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不同条件下9-(羟基亚氨基)-4-甲基-8,9-二氢呋喃并[2,3-h]苯并呋喃-2-酮与酰氯酯化反应的研究
DOI:
10.1016/j.cclet.2008.04.038
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发表时间:
2008-07
期刊:
影响因子:
--
通讯作者:
Yang Wang
中科院分区:
文献类型:
--
作者:
Peng Xia;Rushu Sun;Yang Wang
The esterifications of 9-(hydroxyimino)-4-methyl-8,9-dihydrofuro[2,3-h]chromen-2-one (4) with acid chlorides afforded normal oxime-esters 3a–e in 35–78% yields in presence of excessive 4-dimethylaminopyridine as the acid scavenger, whereas the reactions gave unexpected 8-substituted products N-(8-chloro-4-methyl-2-oxo-2H-furo-[2,3-h]chromen-9-yl)amides (5a–c) and 4-methyl-2,9-dioxo-8,9-dihydro-2H-furo[2,3-h]chromen-8-ylcarboxyloates (6d–e) by using excessive acid chlorides. The structures of 10 new compounds were determined by1H NMR,13C NMR, MS and HRMS, and the possible mechanism for the formation of unexpected products 5a–c and 6d–e was also proposed.
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