Biology-Oriented Synthesis of a Tetrahydroisoquinoline-Based Compound Collection Targeting Microtubule Polymerization
作者:Tobias J. Zimmermann、Sayantani Roy、Nancy E. Martinez、Slava Ziegler、Christian Hedberg、Herbert Waldmann
DOI:10.1002/cbic.201200711
日期:2013.2.11
In the third place: Inspired by the tetrahydroisoquinoline (THIQ) alkaloid noscapine, inhibitors of tubulin polymerization that bind to a site different from the colchicine and the vinca alkaloid binding sites have been synthesized. One compound is more potent than noscapine in HeLa cells and can overcome resistance to chemotherapeutics.
A concise and efficient totalsynthesis of alkaloid narceine imide is disclosed. The key steps are based upon the sequential construction of the isoindolinone template followed by metalation and coupling with an isoquinolinium salt. Subsequent E1cb elimination enables the creation of the arylmethylene unit with the concomitant formation of the dimethylaminoethyl chain and ultimate deprotection completes
A new, convergent total synthesis of (+/-)-alpha-noscapine was developed on a grams scale through the condensation of 3-trimethylsilyl-meconin derivative 9 and the iodized salt cotarnine derivative 20 as the key step. Staring from simple 2,3-dimethoxybenzoic acid, piperonal and 2,2-dimethoxyethanamine, through the traditional chemical processes to give the final product in 11.6% yield over 14 steps.
Novel zinc-promoted alkylation of iminium salts. New synthesis of benzylisoquinoline, phthalidylisoquinoline, and protoberberine alkaloids and related compounds