- Preparing technology of chiral N-BOC-pyrrolidine-2-boric acid
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The invention discloses a preparing technology of chiral N-BOC-pyrrolidine-2-boric acid, and belongs to the field of agent intermediate synthesis. N-BOC-pyrrolidine and sec-butyllithium are subjectedto proton abstraction at low temperature, halogen boron agent is added, after a reaction is completed, saturated ammonium chloride is added to conduct cancellation, after evaporation to dryness of anorganic layer, mandelic acid and ethyl acetate are added, and after salt resolution, acidic hydrolysis is conducted to obtain chiral N-BOC-pyrrolidine-2-boric acid. By means of the method, the operating steps are short, raw materials are easily recycled, products with two structures can be obtained simply by changing the structure of a resolving agent, and the preparing technology has potential practical value.
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- A (-)-sparteine-directed highly enantioselective synthesis of boroproline. Solid- and solution-state structure and properties
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(Chemical Equation Presented) A two-step, direct asymmetric synthesis of the trifluoroacetate ammonium salt of boroproline is reported. (-)-Sparteine-mediated lithiation of N-Boc-pyrrolidine afforded N-Boc-aminoboronic acid in good yield and enantioselectivity as determined by HPLC (pinanediol ester). Deprotection using TFA yielded the ammonium salt; full characterization data are presented, and the structure in aqueous solution and the occurrence of a B-N species are discussed.
- Batsanov, Andrei S.,Grosjean, Christophe,Schuetz, Thorben,Whiting, Andrew
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p. 6276 - 6279
(2008/02/10)
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- A practical synthesis of L-valyl-pyrrolidine-(2R)-boronic acid: Efficient recycling of the costly chiral auxiliary (+)-pinanediol
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A practical synthesis of L-valyl-pyrrolidine-(2R)-boronic acid (1) is detailed. A previously disclosed synthesis of 1 (Snow, R.; Kelly, T. R.; Adams, J.; Coutts, S.; Perry, C. (Boehringer Ingelheim Pharmaceuticals, Inc.). WO 93/10127, 1993) was significantly improved by developing an efficient process for recycling the costly chiral auxiliary (+)- pinanediol.
- Gibson, Frank S.,Singh, Ambarish K.,Soumeillant, Maxime C.,Manchand, Percy S.,Humora, Michael,Kronenthal, David R.
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p. 814 - 816
(2013/09/06)
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