Catalytic Asymmetric Synthesis of 2-Alkyleneoxetanes through [2+2] Annulation of Allenoates with Trifluoromethyl Ketones
作者:Qian-Yi Zhao、Long Huang、Yin Wei、Min Shi
DOI:10.1002/adsc.201200237
日期:2012.7.9
enantioselective [2+2] annulation of allenoates with trifluoromethylketones has been disclosed, allowing the synthesis of optically active 2‐alkyleneoxetanes in moderate to good yields along with good to high enantioselectivities and high diastereoselectivities. Further transformations of the cycloadducts have been also disclosed to afford biologically interesting 6‐trifluoromethyl‐5,6‐dihydropyran‐2‐ones and