Novel Lipase-Catalysed Enantioselective Deacetylation of (±)-5-Acetoxy-3-(4-fluorophenyl)-2-phenylisoxazolidine
作者:Shubhasish Mukherjee、Ashok K Prasad、Virinder S Parmar、Oliver W Howarth
DOI:10.1016/s0960-894x(01)00390-0
日期:2001.8
(+/-)-5-Acetoxy-3-(4-fluorophenyl)-2-phenylisoxazolidine has been synthesised by a highly diastereoselective [3+2] cycloaddition reaction between alpha-(4-fluorophenyl)-N-phenylnitrone and vinyl acetate in good yield. Candida rugosa lipase catalyses the deacetylation of this (+/-)-5-acetoxyisoxazolidine in a highly enantioselective fashion in diisopropyl ether containing n-butanol affording (-)-5-acetoxy-3-(4-fluorophenyl)-2-phenylisoxazolidine in 43% yield and > 99% cc. (C) 2001 Elsevier Science Ltd. All rights reserved.
(+/-)-5-乙酰氧基-3-(4-氟苯基)-2-苯基异恶唑烷通过α-(4-氟苯基)-N-苯基硝酮与乙酸乙烯酯之间的高非对映选择性[3+2]环加成反应,在良好收率下成功合成。Candida rugosa (粗糙念珠菌) 脂酶在含有正丁醇的二异丙醚中,对这一(+/-)-5-乙酰氧基异恶唑烷进行高效对映选择性去乙酰化,得到(-)-5-乙酰氧基-3-(4-氟苯基)-2-苯基异恶唑烷,收率为43%,ee值>99%。