SYNTHESIS OF PHOSPHONIC ACIDS RELATED TO THE ANTIBIOTIC FOSMIDOMYCIN FROM ALLYLIC α- AND γ-HYDROXYPHOSPHONATES
作者:Elisabeth Öhler、Silvia Kanzler
DOI:10.1080/10426509608046350
日期:1996.5.1
high (E)-stereoselectivity to give the protected (3-N-hydroxyamino-1-alkenyl)-phosphonates 5 and 6, respectively, with very good yields. Alternatively compounds 5 and 6 are obtained in excellent yields from the (3-hydroxy-l-alkenyl)phosphonates 2 under Mitsunobu conditions using 3a and 3b, respectively, as nucleophiles. Much less satisfactory yields of compounds 7 and 8 have been obtained in both pathways
摘要 Pd(O) 催化二烷基 (1-甲氧基羰基氧基-2-烯基) 膦酸酯 4 (R3 = H) 与 N,O-烷氧基羰基保护的羟胺 BocNHOBoc (3a) 和 MocNHOMoc (3b) 进行区域特异性和高 (E )-立体选择性,分别得到受保护的 (3-N-羟基氨基-1-烯基)-膦酸酯 5 和 6,产率非常好。或者,在Mitsunobu条件下,分别使用3a和3b作为亲核试剂,由(3-羟基-1-烯基)膦酸酯2以优异的产率获得化合物5和6。在分别使用羟胺衍生物 BocNHOBn (3c) 和 AcNHOAc (3d) 作为亲核试剂的两种途径中,化合物 7 和 8 的产率都不太令人满意。