Approaches to <i>N</i>-Methylwelwitindolinone C Isothiocyanate: Facile Synthesis of the Tetracyclic Core
作者:Richard W. Heidebrecht、Brian Gulledge、Stephen F. Martin
DOI:10.1021/ol1006373
日期:2010.6.4
isothiocyanate is reported. The approach features a convergent coupling between an indole iminium ion and a highly functionalized vinylogous silyl ketene acetal followed by an intramolecular palladium-catalyzed cyclization that proceeds via an enolate arylation.
报道了N- methylwelwitindolinone C 异硫氰酸酯的官能化四环核心的合成。该方法的特点是吲哚亚胺离子和高度官能化的乙烯基甲硅烷基乙烯酮缩醛之间的会聚偶联,然后是通过烯醇芳基化进行的分子内钯催化环化。
Total Synthesis of (−)-<i>N</i>-Methylwelwitindolinone C Isothiocyanate Based on a Pd-Catalyzed Tandem Enolate Coupling Strategy
The highly stereocontrolled totalsynthesis of (−)-N-methylwelwitindolinone C isothiocyanate is described, which features the expeditious construction of a bicyclo[4.3.1]decane ring system by a palladium-catalyzed tandem enolate allylation/arylation reaction.
Total Synthesis of<i>N</i>-Methylwelwitindolinone D Isonitrile
作者:Vikram Bhat、Kevin M. Allan、Viresh H. Rawal
DOI:10.1021/ja201834u
日期:2011.4.20
Described is a concise totalsynthesis of N-methylwelwitindolinone Disonitrile, the first in a family of complex bicyclo[4.3.1]decane-containing indole alkaloids to yield to synthesis. The complete carbon core of the natural product was assembled rapidly through a Lewis acid-mediated alkylative coupling followed directly by a palladium-catalyzed enolate arylation reaction. The final ring of the pentacycle
描述了 N-methylwelwitindolinone D 异腈的简明全合成,这是一个复杂的含双环 [4.3.1] 癸烷的吲哚生物碱家族中第一个合成的。天然产物的完整碳核通过路易斯酸介导的烷基化偶联快速组装,然后直接进行钯催化的烯醇芳基化反应。五环的最后一个环通过吲哚氧化/环化引入,异腈通过醛重排为异硫氰酸酯然后脱硫安装。
Formal Syntheses of Naturally Occurring Welwitindolinones
作者:Tsung-hao Fu、William T. McElroy、Mariam Shamszad、Stephen F. Martin
DOI:10.1021/ol301424h
日期:2012.8.3
The formal syntheses of N-methylwelwitindolinone C isothiocyanate, N-methylwelwitindolinone C isonitrile, N-methylwelwitindolinone D isonitrile, 3-hydroxy-N-methylwelwitindolinone C isothiocyanate, and 3-hydroxy-N-methylwelwitindolinone C isonitrile are reported. The synthesis features several novel processes, Including a Lewis acid mediated coupling between a benzylic-type heteroaromatic alcohol and a highly functionalized silyl ketene acetal, an intramolecular enolate arylation, and a regioselective, Pd(0)-catalyzed pi-allylic cyclization of a gamma-benzoyloxy enone moiety that is revealed by unmasking a furan ring.
Studies toward welwitindolinones: formal syntheses of N-methylwelwitindolinone C isothiocyanate and related natural products
作者:Tsung-hao Fu、William T. McElroy、Mariam Shamszad、Richard W. Heidebrecht、Brian Gulledge、Stephen F. Martin
DOI:10.1016/j.tet.2013.03.010
日期:2013.7
welwitindolinones 5–8 were achieved by the independent synthesis of 79. The synthesis featured a Lewis acid-mediated coupling between a heteroaryl carbinol and bis-TMS enol ether, an intramolecularenolate arylation, and an unprecedented intramolecularallylic alkylation of a γ-acyloxyenone.