Stereoselective Total Synthesis of Tarchonanthuslactone and Formal Synthesis of (-)-Colletol
作者:J. Yadav、P. Reddy、Manoj Gupta、Ch. Chary
DOI:10.1055/s-2007-990850
日期:2007.12
A simple and efficient stereoselective total synthesis of tarchonanthuslactone and formalsynthesis of (-)-colletol is described using as the key steps Jacobsen's kinetic resolution and a Sharpless asymmetric epoxidation. The synthesis of tarchonanthus- lactone and the seco acid proceeded in 14% and 13% overall yield, respectively, starting from chiral (R)-propylene oxide.
(+)-Decarestrictine L was prepared via intramolecular 1,4-addition of the oxy-anion, derived from trialkylsilyl ether with Bu4NF, to the internal γ-hydroxy enone functionality, formed by the reaction of p-chlorobenzenesulfinylpropan-2-one with R-5-t-butyldimethylsilyloxyhexanal.
(+)-Decarestrictine L 通过分子内 1,4-加成法制备,该法使用由三烷基硅醚与 Bu4NF 反应生成的氧负离子,将其加成至由 p-氯苯亚磺酰基丙酮-2-酮与 R-5-叔丁基二甲基硅氧基己醛反应形成的内部 γ-羟基烯酮功能团上。
Yamada, Shinya; Tanaka, Akira; Oritani, Takayuki, Bioscience, Biotechnology and Biochemistry, 1995, vol. 59, # 9, p. 1657 - 1660
作者:Yamada, Shinya、Tanaka, Akira、Oritani, Takayuki
DOI:——
日期:——
Stereoselective first total synthesis, confirmation of the absolute configuration and bioevaluation of botryolide-E
A simple, first stereoselective total synthesis of botryolide-E has been described. The synthesis started from propylene oxide employing Jacobsen's hydrolytic kinetic resolution (HKR), selective epoxide opening, sharpless asymmetric dihydroxylation, one pot acetonide deprotection and lactonization as key steps. Further, the synthesis confirms the absolute configuration of the natural product botryolide-E and we evaluated the biological behavior of natural product botryolide-E against a panel of bacteria and fungi. Botryolide-E exhibits significant potent activity against Staphylococcus aureus (MTCC 96) (6.25 mu g/ml), good against Escherichia coli (MTCC 443) (12.5 mu g/ml), Bacillus subtilis (MTCC 441) (25 mu g/ml) and compound 1 exhibited good to moderate antifungal activity. (C) 2010 Elsevier Ltd. All rights reserved.