作者:Noriki Kutsumura、Yasuaki Koyama、Yuko Suzuki、Ken-ichi Tominaga、Naoshi Yamamoto、Tsuyoshi Saitoh、Yasuyuki Nagumo、Hiroshi Nagase
DOI:10.1021/acs.orglett.8b00288
日期:2018.3.16
The aldol condensation of naltrexone with various aryl aldehydes gives the corresponding 7-benzylidenenaltrexone derivatives in high yields. However, novel C-ring-contracted morphinan compounds were produced when 2-pyridinecarboxaldehyde or its related analogues were used as a coupling partner. The key structural feature was the existence of the tetrahydrofuran ring (4,5-epoxy ring, E-ring) of the
纳曲酮与各种芳基醛的醛醇缩合以高收率得到相应的7-亚苄基纳曲酮衍生物。但是,当将2-吡啶甲醛或其相关类似物用作偶联伴侣时,会产生新颖的C环缩合的吗啡喃化合物。主要的结构特征是吗啡喃骨架的四氢呋喃环(4,5-环氧环,E环)的存在。反应系统的时间分辨原位红外光谱表明,扭曲的环丙烷酮中间体的吸收时间很短。