Ketenes have been found to cycloadd with (R)-2-tert-Butyldihydrooxazole 1 and 2 to yield predominantly regioisomers 4 resulting from steric control rather than electronic control. The cycloadditions provide a practical route to enantiomerically pure protected 2-amino-3-hydroxycyclobutanones.
已发现酮与(R)-2-叔丁基二氢
恶唑1和2环加成,主要产生由于空间控制而不是电子控制的区域异构体4。环加成提供了对映体纯的保护的2-
氨基-
3-羟基环丁酮的实用途径。