The present invention relates generally to novel methods for the preparation 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 with superior anti-retroviral activity. In the process, for example, cyclopropane carboxaldehyde is alkylated to form 1,1,1-trichloro-2-cyclopropyl-ethanol; which in turn undergoes elimination to form 1,1-dichloro-2-cyclopropyl-ethene; which in turn undergoes elimination to form cyclopropyl acetylene.
本发明涉及一种用于制备环丙基
乙炔的新方法,环丙基
乙炔是(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-酮不对称合成中的必需试剂;这是一种具有优越抗逆转录病毒活性的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;然后经过消除反应形成
1,1-二氯-2-环丙基乙烯;然后再经过消除反应形成环丙基
乙炔。