trans-4-azido-L- and -D-proline is reported. These compounds have been synthesized from the corresponding hydroxyproline precursors using diphenylphosphoryl azide under Mitsunobu conditions. Short, highly efficient syntheses of these precursors are described, based on a new lactone-opening reaction and p-nitrobenzoate hydrolysis under very mild conditions.
[结构:见正文]据报道,保护的顺式和反式3-
叠氮基-
L-脯氨酸以及顺式和反式-4-
叠氮基-L-和-
D-脯氨酸的合成方法得到了改进。这些化合物已经由二苯基
磷酰基
叠氮化物在Mitsunobu条件下由相应的羟脯
氨酸前体合成。基于新的内酯开放反应和在非常温和的条件下
对硝基苯甲酸酯
水解,描述了这些前体的短而高效的合成。