Torquoselective: Enantiomers of axially chiral α,β‐unsaturated amidines were prepared by catalytic cascade reactions consisting of [2+2] cycloaddition and thermal cycloreversion. The cascade reaction proceeds in a stereoselective (torquoselective) manner, confirmed by the intermediate depicted.
选择性的选择:通过催化级联反应,由[2 + 2]环加成反应和热环还原反应制得轴向手性α,β-不饱和am的对映异构体。级联反应以立体选择性(
对苯二酚选择性)方式进行,已通过所描述的中间体证实。