Chiral synthesis of polyketide-derived natural products. XXXIV. Facile total synthesis of carbonolides by Witting-Horner macro-cyclization and stereoselective expoxidation.
作者:Noriyuki NAKAJIMA、Kouichi UOTO、Osamu YONEMITSU、Tadashi HATA
DOI:10.1248/cpb.39.64
日期:——
Sixteen-membered dienone type macrolide aglycons, carbonolide B (1), niddanolide (5), and platenolide W1 (6), were synthesized highly stereoselectively from D-glucose via Yamaguchi's esterification of two fragments, 8 (C1-C10) and 9 (C11-C16), followed by Witting-Horner cyclization. Stereoselective epoxidation of the 16-membered dienones (34, 35) gave epoxy-enone-type macrolide aglycons, carbonolide A (2) and EOP aglycon (7).
以 D-葡萄糖为原料,通过 Yamaguchi 酯化 8(C1-C10)和 9(C11-C16)两个片段,然后进行 Witting-Horner 环化反应,高度立体选择性地合成了 16 元二烯酮型大环内酯苷元--碳酰内酯 B (1)、尼达诺尔内酯 (5) 和普拉烯内酯 W1 (6)。16 元二烯酮的立体选择性环氧化反应(34、35)产生了环氧烯酮型大环内酯缩合物、carbonolide A(2)和 EOP 缩合物(7)。