申请人:Dupont Pharmaceuticals Company
公开号:US06288297B1
公开(公告)日:2001-09-11
The present invention relates generally to novel methods for the synthesis of cyclopropylacetylene which is an essential reagent in the asymmetric synthesis of (S)-6-chloro-4-cyclopropylethynyl-4-trifluoromethyl-1,4-dihydro-2H-3,1-benzoxazin-2-one; a useful human immunodeficiency virus (HIV) reverse transcriptase inhibitor. In the process, for example, cyclopropane carboxaldehyde is alkylated to form 1,1,1-trichloro-2-cyclopropyl-ethanol; which in turn is hydroxy protected to form 1,1,1-trichloro-2-cyclopropylethyltosylate; which in turn undergoes elimination to form cyclopropyl acetylene. This improvement provides for high conversion of inexpensive, readily available starting materials into cyclopropylacetylene, high overall yields and can be conducted on an industrial scale.
本发明涉及一种新型合成环丙基乙炔的方法,该方法是(S)-6-氯-4-环丙基乙炔基-4-三氟甲基-1,4-二氢-2H-3,1-苯并噁唑-2-酮的不对称合成中的一种必需试剂;这是一种有用的人类免疫缺陷病毒(HIV)逆转录酶抑制剂。在这个过程中,例如,环丙烷甲醛被烷基化形成1,1,1-三氯-2-环丙基乙醇;然后被羟基保护形成1,1,1-三氯-2-环丙基乙基对甲苯磺酸酯;然后经过消除反应形成环丙基乙炔。这种改进提供了将廉价易得的起始原料转化为环丙基乙炔的高转化率,高总产率,并且可以在工业规模上进行。