| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | 3-acetyloxy-4-phenyl-2-azetidinone | 185222-11-1 | C11H11NO3 | 205.213 |
| (3R,4S)-3-羟基-4-苯基-2-氮杂环丁酮 | (3R,4S)-3-hydroxy-4-phenylazetidin-2-one | 132127-34-5 | C9H9NO2 | 163.176 |
| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | (3R-cis)-3-acetyloxy-4-phenyl-2-azetidinone | 133066-59-8 | C11H11NO3 | 205.213 |
| 卡巴他赛杂质12 | (-)-cis-3(S)-hydroxy-4(S)-phenylazetidin-2-one | 146924-92-7 | C9H9NO2 | 163.176 |
| (3R,4S)-3-羟基-4-苯基-2-氮杂环丁酮 | (3R,4S)-3-hydroxy-4-phenylazetidin-2-one | 132127-34-5 | C9H9NO2 | 163.176 |
A convenient, high-yielding procedure has been developed for the kilogram-scale synthesis of (±)-cis-3-acetoxy-4-phenylazetidin-2-one (3), a β-lactam that has been used in the semi-synthesis of Taxol®. The Staudinger reaction between hydrobenzamide (5) and acetoxyacetyl chloride in the presence of a base provided the α-benzylideneiminotoluene protected β-lactam 8. Without isolation of the intermediate β-lactam, the protecting group was removed under various reductive or hydrolytic conditions. The overall yields were about 80%. The synthesis of other (±)-cis-4-aryl- and 4-heteroarylazetidin-2-ones by this methodology has also been accomplished. These compounds are of value for the synthesis of 3′-Taxol® side-chain analogs and their preparation demonstrates the generality of this approach.