Novel Asymmetric Formylation of Aromatic Compounds: Enantioselective Synthesis of Formyl 7,8-Dipropyltetrathia[7]helicenes
作者:Julien Doulcet、G. Richard Stephenson
DOI:10.1002/chem.201501627
日期:2015.9.14
Asymmetric formylation of aromatic compounds is virtually unexplored. We report the synthesis and evaluation of a library including 20 new chiral formamides in the kinetic resolution of 7,8‐dipropyltetrathia[7]helicene, affording the corresponding formyl‐ or diformylhelicenes in up to 73 % ee, making enantiopure compounds available by recrystallisation. With the N,N‐disubstituted formamides used in
芳香族化合物的不对称甲酰化实际上是未开发的。我们报告了在20,8-二丙基四硫杂[7]螺旋动力学拆分中包括20种新的手性甲酰胺的文库的合成和评估,提供了高达73%ee的相应的甲酰基-或二甲酰基螺旋烯,通过重结晶可得到对映纯化合物。通过本研究中使用的N,N-二取代甲酰胺,R 1 = i Pr,R 2 = Me,R 3 = H,R 4 = 1-萘基或其等价基团达到了最佳的对映选择性。