Indium(III) Triflate-Catalyzed Efficient Prins-Type Cyclization of β-Allenols and Aldehydes
作者:Yulin Han、Xinjun Tang、Jiajia Cheng、Shengming Ma
DOI:10.1002/adsc.201600588
日期:2016.12.22
We report here an indium(III) triflate (In(OTf)3)‐catalyzed Prins‐type cyclization of disubstituted β‐allenols in the presence of aldehydes in dichloromethane (CH2Cl2) affording different 3,6‐dihydro‐2H‐pyran at room temperature or 45 °C. The high efficiency of the reaction and easily available nature of the starting materials/catalyst make it useful in synthesizing different dihydropyran derivatives