Synthesisvia a Carbohydrate-DerivedM�nchnone of Pyrrolopyridines (Indolizines) and imidazopyridines, and their evaluation as inhibitors of ?-D-glucosidases
作者:Thierry Granier、Florian Gaiser、Lukas Hintermann、Andrea Vasella
DOI:10.1002/hlca.19970800509
日期:1997.8.11
In the presence of activating agents, the N-acylglycine 8 reacts with electrophilic alkynes via the münchnone9 to the pyrrolopyridines (= indolizines) 10, 18, and 19 (Scheme 1 ), Depending on the nature of the activating agent and the reaction temperature, the formation of the pyrroles was accompanied by partial epimerization to the manna-configurated epimers 16 and 17. The gluco-configurated pyrrolopyridine
在活化剂的存在下,Ñ -acylglycine 8种发生反应与亲电子炔经由所述münchnone 9到吡咯并吡啶(=氮茚)10,18,和19(反应路线1),取决于活化剂的性质和反应温度,吡咯的形成伴随着部分差向异构化的甘露聚糖配置差向异构体16和17。所述葡糖-构型的吡咯并吡啶10脱保护,12。硅烷化12,然后进行还原和去甲硅烷基化反应,得到己醇15。9至4-甲苯磺酰氰的环加成产生53%的咪唑23,而环氰酸加成至苯甲酸苯基酯仅以低收率得到苯氧基咪唑28(方案2)。如预期的,脱保护的吡咯12,15,20,和21是保持β葡糖苷酶的弱抑制剂,而脱保护的咪唑24衍生自23证明甜杏仁β葡糖苷酶的良好抑制剂和的强有力抑制剂Caldocellum糖热厌氧杆菌β -葡糖苷酶。