Synthesis of a Capillarisin Sulfur-Analogue Possessing Aldose Reductase Inhibitory Activity by Selective Isopropylation
作者:Yasushi Igarashi、Hiroaki Kumazawa、Toshihoro Ohshima、Hisanori Satomi、Susumu Terabayashi、Shuichi Takeda、Masaki Aburada、Ken-ichi Miyamoto
DOI:10.1248/cpb.53.1088
日期:——
3-iodo-7-isopropoxy-5,6-dimethoxy-4H-chromen-4-one 3. An important feature of this synthetic scheme involves selective alkylation, which can be achieved by two different routes. One route involves the selective isopropylation of a triacetate derivative 4 under basic conditions. The second route employs the selective demethylation of a trimethoxy derivative 5 under acidic conditions followed by isopropylation. The product
我们描述了通过关键中间体3- [3,4,5-三甲氧基苯酚6]合成2-[((4-羟苯基)硫基] -7-异丙氧基-5,6-二甲氧基-4H-chromen-4-one 2碘-7-异丙氧基-5,6-二甲氧基-4H-铬-4--4-酮3.该合成方案的重要特征涉及选择性烷基化,这可以通过两种不同的途径来实现。一种途径涉及在碱性条件下三乙酸酯衍生物4的选择性异丙基化。第二种途径是在酸性条件下对三甲氧基衍生物5进行选择性脱甲基,然后进行异丙基化。然后,通过咪唑基中间体22在一锅法反应中,将这些替代路线的产物化合物3转化为毛细管菌素硫类似物2。