Synthesis of two diastereomers of C-1 ∼ C-14 segment in amphidinolide L
摘要:
In order to determine the stereochemistry of amphidinolide L (1), a cytotoxic macrolide from a marine dinoflagellate, (8S,9S,11R)-2a and (8R,9R,11R)-2b, two diastereomers of the C-1 similar to C-14 segment and (8S,9S,11R)-4a and (8R,9R,11R)-4b, two diastereomers of the C-7 similar to C-14 segment have been synthesized, providing authentic samples for degradation products of 1. (C) 1997 Elsevier Science Ltd. All rights reserved.
作者:Jason Poulin、Christiane M. Grisé-Bard、Louis Barriault
DOI:10.1002/anie.201108779
日期:2012.2.27
Two key reactions in a rapid assembly of the tricyclic core of vinigrol are a stereoselective Claisen rearrangement and an intramolecular Diels–Alder reaction. The method paves the way for a total synthesis of this synthetically challenging and biologically interesting natural product.
Rhodium-Catalyzed <i>Endo</i>-Selective Epoxide-Opening Cascades: Formal Synthesis of (−)-Brevisin
作者:Kurt W. Armbrust、Matthew G. Beaver、Timothy F. Jamison
DOI:10.1021/jacs.5b03570
日期:2015.6.3
an effective catalyst for endo-selective cyclizations and cascades of epoxy-(E)-enoate alcohols, thus enabling the synthesis of oxepanes and oxepane-containing polyethers from di- and trisubstituted epoxides. Syntheses of the ABC and EF ring systems of (-)-brevisin via all endo-diepoxide-opening cascades using this method constitute a formal totalsynthesis and demonstrate the utility of this methodology
[Rh(CO)2Cl]2 是环氧-(E)-烯醇的内选择性环化和级联反应的有效催化剂,因此能够从二取代和三取代环氧化物合成氧杂环庚烷和含氧杂环己烷的聚醚。(-)-brevisin 的 ABC 和 EF 环系统使用这种方法通过所有内双环氧化物开放级联合成构成正式的全合成,并证明了这种方法在合成海洋阶梯聚醚天然产物的背景下的实用性。
A Double Activation Method for the Conversion of Vinyl Epoxides into <i>vic</i>-Amino Alcohols and Chiral Benzoxazine/Quinoxaline Derivatives
作者:Gourishetty Srikanth、Kallaganti V. S. Ramakrishna、Gangavaram V. M. Sharma
DOI:10.1021/acs.orglett.5b02304
日期:2015.9.18
phenyl-o-phenylene borate (a double activation technique), is reported. Further, this new method with broad functional group compatibility was extended to a one-pot/two-step synthesis of chiral benzoxazine and quinoxaline derivatives.