One of the two primary hydroxyl groups of oxetanocin A was protected selectively with acetyl and o-nitrobenzyl groups using enzymatic and photochemical reactions, respectively. On the basis of 1H-NMR spectroscopy and NOE experiment, 4'-O-protected oxetanocin A was found to take syn conformation in an aprotic solvent irrespective of the kind of protecting group owing to an intramolecular hydrogen bond.
通过酶促反应和光
化学反应,分别用乙酰基和邻硝基苄基对氧杂
环丁烷素A的两个主要羟基之一进行选择性保护。根据1H-NMR光谱和NOE实验,发现4'-O-保护的氧杂
环丁烷素A在非质子溶剂中呈现同构构象,这与保护基的种类无关,这是由于分子内氢键的作用。