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http://dx.doi.org/10.5012/bkcs.2012.33.7.2213

From L-Ascorbic Acid to Protease Inhibitors: Practical Synthesis of Key Chiral Epoxide Intermediates for Aspartyl Proteases  

Chang, Sun-Ki (Research Institute for Basic Sciences and Department of Chemistry, College of Sciences, Kyung Hee University)
So, Soon-Mog (Department of Chemistry, Seoul National University, College of Natural Sciences)
Lee, Sang-Min (Department of Chemistry, Seoul National University, College of Natural Sciences)
Kim, Min-Kyu (ST Pharm Co., Ltd. Shihwa Industrial Complex)
Seol, Kyoung-Mee (ST Pharm Co., Ltd. Shihwa Industrial Complex)
Kim, Sung-Min (ST Pharm Co., Ltd. Shihwa Industrial Complex)
Kang, Jae-Sung (ST Pharm Co., Ltd. Shihwa Industrial Complex)
Choo, Dong-Joon (Research Institute for Basic Sciences and Department of Chemistry, College of Sciences, Kyung Hee University)
Lee, Jae-Yeol (Research Institute for Basic Sciences and Department of Chemistry, College of Sciences, Kyung Hee University)
Kim, B.-Moon (Department of Chemistry, Seoul National University, College of Natural Sciences)
Publication Information
Abstract
Efficient synthetic routes were developed to prepare a sizable amount (4-15 grams) of the chiral epoxides 4-6 as versatile intermediates for the synthesis of aspartyl protease inhibitors of therapeutic interest such as HIV protease and ${\beta}$-secretase. Oxidative cleavage of the C(2)-C(3) double bond of L-ascorbic acid followed by functional group manipulation led to the preparation of the epoxide 10, which was opened with an azide to yield a common aziridine intermediate 12. Through opening of the aziridine ring of 12 with either a carbon or a sulfur nucleophile, chiral epoxide precursors 4-6 could be prepared for various HIV protease inhibitors. Except for the final low melting epoxides 5 and 6, all intermediates were obtained as crystalline solids, thus the synthetic pathway can be easily applied to a large-scale synthesis of the chiral epoxides.
Keywords
L-Ascorbic acid; Protease inhibitors; Aziridine opening; HIV protease; Epoxide;
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