Enantioselective preparation of 3,4,5-trisubstituted-4,5-dihydroisoxazoles and 4-substituted-5,6-dihydro-4H-[1,2]-oxazines by nitrile oxide cycloaddition to α-silyl allyl alcohols
作者:Akio Kamimura、Yukio Kaneko、Ayaki Ohta、Akikazu Kakehi、Haruhiko Matsuda、Shuji Kanemasa
DOI:10.1016/s0040-4039(99)00688-7
日期:1999.6
Regio- and stereoselective 1,3-dipolar cycloaddition of nitrile oxide to optically active α-silyl allyl alcohol provides a useful preparation of 3,4,5-trisubstituted 4,5-dihydroisoxazoles, which are readily converted into chiral 4-substituted 5,6-dihydro-4H-[1,2]-oxazines in 73–100% yields on treatment with TBAF.
氧化腈与旋光性α-甲硅烷基烯丙醇的区域和立体选择性1,3-偶极环加成反应提供了有用的3,4,5-三取代4,5-二氢异恶唑的制备方法,它们很容易转化为手性4-取代的5,TBAF处理后,6-dihydro-4 H- [1,2]-恶嗪的收率为73-100%。