Synthesis of (+)-(S)-Streptenol A and Biomimetic Synthesis of (2R,4S)- and (2S,4S)-2-(Pent-3-enyl)piperidin-4-ol
摘要:
(+)-(S)-Streptenol A 是通过将 1,3-二硫杂烯与光学纯的环氧化物偶联来合成的。因此,(+)-(S)-streptenol A 的绝对构型与 (S)-苹果酸的构型相关联。从 streptenol A 出发,可以方便地制备出一个肟,并通过对其立体选择性地还原,得到了 (3S,5R)-和 (3S,5S)-氨基streptenol。经过环化后,进一步获得了构型纯的 2,4-官能化哌啶生物碱。
Synthesis of (+)-(S)-Streptenol A and Biomimetic Synthesis of (2R,4S)- and (2S,4S)-2-(Pent-3-enyl)piperidin-4-ol
摘要:
(+)-(S)-Streptenol A 是通过将 1,3-二硫杂烯与光学纯的环氧化物偶联来合成的。因此,(+)-(S)-streptenol A 的绝对构型与 (S)-苹果酸的构型相关联。从 streptenol A 出发,可以方便地制备出一个肟,并通过对其立体选择性地还原,得到了 (3S,5R)-和 (3S,5S)-氨基streptenol。经过环化后,进一步获得了构型纯的 2,4-官能化哌啶生物碱。
Total Synthesis of the CP-Molecules (CP-263,114 and CP-225,917, Phomoidrides B and A). 2. Model Studies for the Construction of Key Structural Elements and First-Generation Strategy
作者:K. C. Nicolaou、P. S. Baran、Y.-L. Zhong、K. C. Fong、H.-S. Choi
DOI:10.1021/ja012011d
日期:2002.3.1
the development of methodology for the construction of the maleic anhydride moiety of the CP-molecules are described. Studies directed toward the stereoselective attachment of the upper side chain, culminating in the discovery of long-range stereochemical control, are also discussed. In addition, a first-generation strategy toward the CP-molecules, establishing key intermediate 5 as a "beachhead" from
efficient silyloxy-Coperearrangement that delivers the tetracyclic core of phomoidrides B and D. Several examples of this powerful tandem reaction are presented that document its tolerance of significant structural variation. The application of this methodology to the synthesis of a phomoidride D precursor lacking only the maleic anhydride is described, and the prospects for the completion of a total synthesis
作者:Graham K. Murphy、Tatsuya Shirahata、Naoto Hama、Aaron Bedermann、Ping Dong、Travis C. McMahon、Barry M. Twenter、David A. Spiegel、Ivar M. McDonald、Nobuaki Taniguchi、Munenori Inoue、John L. Wood
DOI:10.1021/jo302353g
日期:2013.1.18
An efficient and highly stereoselective approach toward the phomoidride family of natural products is described. The carbocyclic core structure was assembled using a tandem phenolic oxidation/Diels-Alder cycloaddition and a tandem 5-exo-trig/5-exo-trig radical cyclization to deliver an isotwistane intermediate that, upon a late-stage xanthate-initiated Grob fragmentation, furnishes the requisite bicyclo[4.3.1]decene.