Synthesis of the B/C-ring system of tetronasin (ICI-139603).
作者:Kozo HORI、Shuho MORI、Keiichi NOMURA、Atsushi INAGAKI、Eiichi YOSHII
DOI:10.1248/cpb.38.1784
日期:——
An efficient entry to the tetrahydropyran/cyclohexane moiety of tetronasin has been developed. An aldol reaction between a cyclohexanecarboxaldehyde, 8, and a (tetrahydropyranyl)acetate, 9, under controlled conditions followed by dehydration of the adduct 10 afforded predominantly (E)-ester 11, which on photoisomerization and subsequent reduction with iso-Bu2AlH provided the B/C ring system 13.
已开发出一种有效进入四氢吡喃/环己烷部分的方法。在受控条件下,环己烷甲醛(8)与(四氢吡喃基)乙酸酯(9)发生醛缩反应,随后脱去加合物(10)中的水分,主要得到(E)-酯(11),后者经光异构化并随后与异丁基二铝氢还原,得到B/C环系统(13)。