Tricyclic bromoether17, which contained twenty of thirty carbons of thyrsiferol (1d), was synthesized in optically active form starting from trivial compounds2 and3.
从琐碎的化合物2和3开始,以光学活性形式合成了含有三十个碳原子的酪氨醇(1d)的三环溴醚17。
Total synthesis of (+)-Eurylene
作者:Kazuya Ujihara、Haruhisa Shirahama
DOI:10.1016/0040-4039(96)00212-2
日期:1996.3
Eurylene 1, a cytotoxic bicyclic squalenoid isolated from Eurycoma longifola, has been synthesized utilizing the double vanadium(V)-catalyzed oxidation reaction of different bishomoallyl alcohol systems.
Studies toward the Total Synthesis of Gymnocin A, a Cytotoxic Polyether: A Highly Convergent Entry to the F−N Ring Fragment
作者:Makoto Sasaki、Chihiro Tsukano、Kazuo Tachibana
DOI:10.1021/ol025814u
日期:2002.5.1
[GRAPHICS]An efficient and highly convergent synthesis of the FGHIJKLMN ring fragment of gymnocin A, a cyctotoxic polycyclic ether isolated from the notorious red-tide forming dinoflagellate Gymnodinium mikimotoi, has been achieved. The present synthesis relied on extensive use of the B-alkyl Suzuki-Miyaura coupling reaction.
Total synthesis of the meso-triterpene polyether teurilene
The first total synthesis of the triterpene ether teurilene (1) has been accomplished utilizing two vanadium(V)-catalyzed oxidation-cyclization reactions with different stereoselectivities. The synthesis involved stereoselective and step-by-step construction of 2,5-cis- and 2,5-trans-tetrahydrofuran rings, vanadium(V)-catalyzed oxidation of 4-substituted 4-en-1-ol 40 and subsequent cyclization of the resulting anti-epoxy alcohol 41, and a similar oxidation-cyclization of 5-substituted 4-en-1-ol 49 by way of syn-epoxy alcohol 50. This was followed by construction of a third tetrahydrofuran ring by more conventional means. An improved synthesis of 1, which featured direct formation of bis(tetrahydrofuran) 51 from squalene derivative 66 by simultaneous double oxidation-cyclization, was also accomplished.
A short step synthesis of teurilene. Stereocontrolled sequential double cyclization of the C30-tetraenetetraol to the tandem tetrahydrofuran system