作者:Daniele Lo Re、Francisco Franco、Fernando Sánchez-Cantalejo、Juan A. Tamayo
DOI:10.1002/ejoc.200801232
日期:——
starting material for the synthesis of (1S,4R,5S,6S,7S)-4-amino-6-benzyloxy-1,7-isopropylidenedioxy-8-oxabicyclo[3.2.1]octane (33) and (1S,4S,5S,6S,7S)-4-amino-6-benzyloxy-1,7-isopropylidenedioxy-8-oxabicyclo[3.2.1]octane (34) through carbon chain-lengthening at C-1 and C-6 by Wittig and magnesium-mediated alkylation methodology, respectively, followed by ring-closing olefin metathesis (RCM). These promising
众所周知的 2,3:4,6-二-O-异亚丙基-α-L-山梨呋喃糖 (12) 被选为合成 (1S,4R,5S,6S,7S)-4-氨基- 6-benzyloxy-1,7-isopropylidenedioxy-8-oxabicyclo[3.2.1]octane (33) 和 (1S,4S,5S,6S,7S)-4-amino-6-benzyloxy-1,7-isopropylidenedioxy-8 -氧杂双环 [3.2.1] 辛烷 (34) 通过 Wittig 和镁介导的烷基化方法分别在 C-1 和 C-6 处延长碳链,然后进行闭环烯烃复分解 (RCM)。这些有前景的氧杂双环化合物是制备多羟基去甲托烷生物碱 1,3,5-tri-epi-calystegine B2 (10) 作为其 3-O-苄基衍生物 35 的关键中间体。 (© Wiley-VCH Verlag GmbH & Co. KGaA