作者:Tuan K. Nguyen、Gleb D. Titov、Olesya V. Khoroshilova、Mikhail A. Kinzhalov、Nikolai V. Rostovskii
DOI:10.1039/d0ob00693a
日期:——
A one-pot procedure for the synthesis of tetrasubstituted dihydropyrimidine and pyrimidine derivatives from α-azidocinnamates was developed. The synthesis is based on the finding that the outcome of LED photolysis of α-azidocinnamates depends on the light wavelength employed. Blue light (455 nm) leads to the formation of 2H-azirines only, but violet light (395 nm), UV-A light (365 nm), or sunlight
开发了一种一锅法,可从α-叠氮基壬二酸酯合成四取代的二氢嘧啶和嘧啶衍生物。该合成基于以下发现:α-叠氮二胍的LED光解结果取决于所采用的光波长。蓝光(455 nm)仅导致2 H-叠氮基的形成,而紫光(395 nm),UV-A光(365 nm)或日光导致原位形成的2 H-叠氮基转化为1,3-二氮杂双环[3.1.0]己-3-烯。在碱性催化(DBU)下,后者被异构化为1,6-二氢嘧啶,然后使用DDQ将其氧化为嘧啶。还证明了Cs 2 CO 3作为碱和空气作为氧化剂的成功使用。