with trifluoroacetic acid. The reaction occurs at the C(2) position under inversion of configuration. Alternatively, 3-aminooxetanes can be ring-opened at the less substituted C(4) position with retention of the relative configuration between C(2) and C(3) as exemplified by the synthesis of (±)-pseudoephedrine (2). The cis-3-aminooxetanes serve as precursors for either syn- or anti-1,2-amino alcohols.
ñ -吨丁氧基羰(BOC)取代的顺式-2-苯基-3- aminooxetanes 3经历扩环至
恶唑烷酮5在用
三氟乙酸处理。反应在构型反转下发生在C(2)位置。或者,3-
氨基氧杂
环丁烷可以在取代度较低的C(4)位置开环,保留C(2)和C(3)之间的相对构型,如合成(±)-伪
麻黄碱(2)所示。的顺式-3- aminooxetanes作为前体或者顺式-或反-1,2-
氨基醇。