enantiomeric purity from readily available anti-N-Boc-1-tert-butyldimethylsilyl-3-amino-1,2-diols. The preparation of the anti series is straightforward, and takes place by protection of the secondary hydroxyl group (1-ethoxyethyl) followed by desilylation/oxidation of the primary hydroxyl group. For the preparation of the syn isomers, the secondary alcohol is inverted at the beginning of the sequence by Mitsunobu
既抗和顺-α-羟基-β-
氨基酸以保护的形式和高对映体纯度是有效地合成从容易获得的抗N -Boc-1-叔丁基二-3-
氨基-1,2
-二醇。抗系列的制备是直接的,并且通过保护仲羟基(
1-乙氧基乙基),然后对伯羟基进行甲
硅烷基化/氧化来进行。为了制备顺式异构体,通过Mitsunobu方法(
对硝基苯甲酸酯)将仲醇在序列的开始处反转。从同手性(2 S,3 S)-N开始易于偶联的Taxotere®侧链的-Boc-1-叔丁基二甲基甲
硅烷基-3-
氨基-
3-苯基丙烷-1,2-二醇已制成对映体纯形式。