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  ____     __   __              _____    _____    
 |  _ \\   \ \\/ //     ___    |  ___|| |  __ \\  
 | |_| ||   \ ` //     /   ||  | ||__   | |  \ || 
 | .  //     | ||     | [] ||  | ||__   | |__/ || 
 |_|\_\\     |_||      \__ ||  |_____|| |_____//  
 `-` --`     `-`'       -|_||  `-----`   -----`   
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Text this: N-heterocyclic carbene-catalyzed atroposelective annulation for access to thiazine derivatives with C-N axial chirality