“…Silyl enol ethers and silyl ketene thioacetals are known to undergo asymmetric hetero-ene reactions with aldehydes. , These are commonly referred to as the Mukaiyama aldol reaction, for which a prototropic or silatropic mechanism has been invoked. Silyl enol ethers derivatives bearing allylic hydrogens are known to proceed through a prototropic mechanism, and in their absence, the silatropic pathway becomes favored. , Despite the significant potential, no asymmetric aza-variant using nitroso compounds has been developed. Herein we report an asymmetric nitrosocarbonyl hetero-ene reaction with silyl enol ether derivatives (Scheme b) …”