Studies in sulfoxide rearrangement: Regioselective synthesis of thieno[3,2-f]quinolin-7(6H)-one derivatives
作者:K.C. Majumdar、P. Biswas
DOI:10.1016/s0040-4020(98)00685-1
日期:1998.9
quantitative yields which were then converted into the 1-aryloxyacetyl-1,2-dihydro-6-methylthieno[3,2-f]quinolin-7(6H)-ones (11a-e) in almost quantitative yields by simply dissolving in absolute MeOH. Dehydrogenative elimination of product 11a-e when treated with acid generates 1-acetyl-6-methylthieno[3,2-f]quinolin-7(6H)-one (12) in 70–76% yield.
通过用锌粉和酸还原性裂解相应的二硫化物2原位制备6-巯基-1-甲基喹啉-2(1 H)-一(3)。在6-氨基-1-甲基喹啉-2-(1 H)-一(1)重氮化后,通过黄药制备二硫化物2。由硫醇3和1-芳氧基-4-氯丁-2-炔(4)制备6-(4-芳氧基丁-2-炔硫基)-1-甲基喹啉-2(1H)-一(5a-e)。然后将硫化物5a-e转化为相应的亚砜6a-e通过在0-5°C下在CH 2 Cl 2中用一当量的m -CPBA处理30分钟。亚砜6a-e在CCl 4中回流1小时,以几乎定量的产率得到单硫基半缩醛7a-e,然后将其转化为1-芳氧基乙酰基-1,2-二氢-6-甲基噻吩并[3,2-通过简单地溶于无水甲醇中,几乎可以定量得到f ] quinolin-7(6 H)-ones(11a-e)。用酸处理后,产物11a-e脱氢消除,生成1-乙酰基-6-甲基硫代[3,2 - f ]喹啉-7(6 H)-one(12),收率为70-76%。