Approach Toward the Total Synthesis of Griseoviridin: Formation of Thioethynyl and Thiovinyl Ether-Containing Nine-Membered Lactones through a Thioalkynylation−Macrolactonization−Hydrostannylation Sequence
作者:Carine Kuligowski、Sophie Bezzenine-Lafollée、Grégory Chaume、Jacqueline Mahuteau、Jean-Claude Barrière、Eric Bacqué、Ange Pancrazi、Janick Ardisson
DOI:10.1021/jo0103120
日期:2002.6.1
Synthesis of the lactone core 17 of 8-epi-griseoviridin is reported. Thioethynyl derivative 11 was easily prepared via an anionic coupling reaction between acetylenic compound 9 and sulfone 10. After desilylation of 11, saponification of the resulting hydroxy ester 12 followed by a Mitsunobu macrolactonization furnished the unusual triple-bond-containing nine-membered lactone 13 in 50% yield for the
据报道,合成了8-表-griseoviridin的内酯核17。硫乙炔基衍生物11可以通过炔属化合物9和砜10之间的阴离子偶联反应轻松制备。11进行甲硅烷基化后,将所得羟基酯12皂化,然后进行Mitsunobu巨内酯化反应,从而得到了不寻常的含三键的九元内酯13。最后两个步骤的收率为50%(重结晶后为39%)。在Magriotis条件下的锡烷基化反应产生了纯的区域控制和立体控制的乙烯基锡14(产率为80%)。在Sn / I交换后,钯催化的羰基化以67%的收率递送酯内酯16或以65%的收率递送炔丙基酰胺17。8-表位-griseoviridin的内酯核心的炔丙基酰胺17的合成在11中完成。