Organocatalytic asymmetric Michael/hemiacetalization/acyl transfer reaction of α-nitroketones with <i>o</i>-hydroxycinnamaldehydes: synthesis of 2,4-disubstituted chromans
作者:Rajendra Maity、Subhas Chandra Pan
DOI:10.1039/c8ob00078f
日期:——
An organocatalytic asymmetric cascade Michael/hemiketalization/acyl transfer reaction between o-hydroxycinnamaldehydes and α-nitroketones is developed. Prolinol TMS ether catalyst in combination with benzoic acid was found to be the most effective for this reaction which proceeds through an equilibrium of lactols to provide a single diastereomer of enantiopure 2,4-disubstituted chromans.
研究了邻羟基肉桂醛与α-硝基酮之间的有机催化不对称级联迈克尔/半缩酮化/酰基转移反应。发现脯氨醇TMS醚催化剂与苯甲酸组合对于该反应是最有效的,该反应通过平衡内酯以提供对映体纯的2,4-二取代的苯并二氢吡喃一个单一的非对映异构体。