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A simple method for synthesizing 7-oxo-4-thia-1-azabicyclo(3.2.0)heptane and its 6-methyl derivatives from ethyl cyanoacetate.
作者:Takuo Chiba、Takumi Takahashi、Junichi Sakaki、Chikara Kaneko
DOI:10.1248/cpb.33.3046
日期:——
Ethyl cyanoacetate (1a) or its methyl derivatives (1b and 1c) were treated with HCl/EtOH to give the corresponding imidates (2a-2c). Treatment of the latter compounds with cysteamine gave ethyl 2-thiazoline-2-acetate (3a-3c), which by reduction with sodium cyanoborohydride in HCl/MeOH gave the corresponding thiazolidines (4a-4c). Hydrolysis followed by β-lactam formation through the use of Mukaiyama-Ohno's reagent afforded 7-oxo-4-thia-1-azabicyclo [3. 2. 0] heptane (6a) and its methylated derivatives (6b and 6c).
氰基乙酸乙酯(1a)或其甲基衍生物(1b 和 1c)经 HCl/EtOH 处理后得到相应的亚胺酸盐(2a-2c)。用半胱胺处理后一种化合物,可得到 2-噻唑啉-2-乙酸乙酯(3a-3c),用氰基硼氢化钠在 HCl/MeOH 中还原,可得到相应的噻唑烷(4a-4c)。使用 Mukaiyama-Ohno 试剂水解后形成 β-内酰胺,得到 7-oxo-4-thia-1-azabicyclo [3.
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Barrett, Anthony G. M.; Mortier, Jacques; Sabat, Michal, Organometallics, 1988, vol. 7, # 12, p. 2553 - 2561
作者:Barrett, Anthony G. M.、Mortier, Jacques、Sabat, Michal、Sturgess, Michael A.
DOI:——
日期:——
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CHIBA, TAKUO;TAKAHASHI, TAKUMI;SAKAKI, JUN-ICHI;KANEKO, CHIKARA, CHEM. AND PHARM. BULL., 1985, 33, N 7, 3046-3049
作者:CHIBA, TAKUO、TAKAHASHI, TAKUMI、SAKAKI, JUN-ICHI、KANEKO, CHIKARA
DOI:——
日期:——
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CHIBA, TAKUO;SAKAKI, JUN-ICHI;TAKAHASHI, TAKUMI;AOKI, KUMI;KAMIYAMA, AKIK+, J. CHEM. SOC. PERKIN TRANS., 1,(1987) N 8, 1845-1851
作者:CHIBA, TAKUO、SAKAKI, JUN-ICHI、TAKAHASHI, TAKUMI、AOKI, KUMI、KAMIYAMA, AKIK+
DOI:——
日期:——
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Chiba, Takuo; Sakaki, Jun-ichi; Takahashi, Takumi, Journal of the Chemical Society. Perkin transactions I, 1987, p. 1845 - 1852
作者:Chiba, Takuo、Sakaki, Jun-ichi、Takahashi, Takumi、Aoki, Kumi、Kamiyama, Akiko、et al.
DOI:——
日期:——