The 7-acetoxyspiropyrans (4a and 4b) have been prepared by the reaction of Fischer's bases (3) with 2,4-diacetoxybenzaldehyde in refluxing ethanol in moderate yields. The acetyl group of 7-acetoxyspiropyran 4a was easily removed to give a 7-hydroxyspiropyran 6 in high yield under the basic condition.
The 7-acetoxyspiropyrans (4a and 4b) have been prepared by the reaction of Fischer's bases (3) with 2,4-diacetoxybenzaldehyde in refluxing ethanol in moderate yields. The acetyl group of 7-acetoxyspiropyran 4a was easily removed to give a 7-hydroxyspiropyran 6 in high yield under the basic condition.
作者:Young Jin Cho、Seung Hwan Lee、Jong Woo Bae、Sung Hoon Kim、Sam Rok Keum、Cheol Min Yoon
DOI:10.1080/00397910008087399
日期:2000.1
The 7-acetoxyspiropyrans (4a and 4b) have been prepared by the reaction of Fischer's bases (3) with 2,4-diacetoxybenzaldehyde in refluxing ethanol in moderate yields. The acetyl group of 7-acetoxyspiropyran 4a was easily removed to give a 7-hydroxyspiropyran 6 in high yield under the basic condition.