Smith Amos B, Dong Shuzhi, Brenneman Jehrod B, Fox Richard J
Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
J Am Chem Soc. 2009 Sep 2;131(34):12109-11. doi: 10.1021/ja906115a.
The final synthetic challenges associated with (+)-sorangicin A have been overcome, thus leading to the first total synthesis of this complex macrolide antibiotic. Highlights of the highly convergent synthesis include two Julia-Kociénski olefinations to unite three advanced fragments with high E-stereoselectivity. Critical to the final-stage success was the use of a carefully defined Stille coupling and a Mukaiyama macrolactonization as well as Lewis and protic acid-promoted deprotections carefully designed to suppress E/Z isomerization and/or destruction of the delicate (Z,Z,E)-trienoate linkage.
与(+)-索兰吉星A相关的最终合成挑战已被克服,从而实现了这种复杂大环内酯类抗生素的首次全合成。高度汇聚合成的亮点包括两次Julia-Kociénski烯烃化反应,以高E-立体选择性将三个高级片段连接起来。最终阶段成功的关键在于使用精心设计的Stille偶联反应和Mukaiyama大环内酯化反应,以及精心设计的路易斯酸和质子酸促进的脱保护反应,以抑制E/Z异构化和/或破坏脆弱的(Z,Z,E)-三烯酸酯键。