Efficient synthesis of chlorohydrins using ClCH2MgCl·LiCl
作者:Rodolfo H.V. Nishimura、Fabiano T. Toledo、João L.C. Lopes、Giuliano C. Clososki
DOI:10.1016/j.tetlet.2012.10.132
日期:2013.1
The mixed lithium-magnesium carbenoid ClCH2MgCl center dot LiCl was easily generated in THF through the reaction of chloroiodomethane with i-PrMgCl-LiCl at -78 degrees C. This reagent reacts well with a number of aldehydes to give the corresponding chlorohydrins in good yields. (C) 2012 Elsevier Ltd. All rights reserved.
A practical enantioselective synthesis of (S)-3-hydroxytetradecanoic acid
作者:Keisuke Matsuyama、Masaya Ikunaka
DOI:10.1016/s0957-4166(99)00290-6
日期:1999.7
(S)-3-Hydroxytetradecanoic acid 1 has been synthesized in an overall yield of 27% from (S)-epichlorohydrin 2 as follows: (1) regio and chemoselective epoxide opening of 2 with a Grignard reagent under the catalysis by Cu(I) followed by consecutive epoxide formation; (2) regioselective epoxide opening of (S)1,2-epoxytridecane 4 with cyanide anion under pH controlled conditions followed by consecutive nitrile hydrolysis with alkaline H2O2 gave crude 1; (3) its purification via the N,N-dicyclohexylammonium salt 6. The method thus devised is practical and scalable for the industrial production of 1. (C) 1999 Elsevier Science Ltd. All rights reserved.