New reactivity patterns in activated indoles with 2-methyl substituents

Catalyzed and uncatalyzed procedures for the syntheses of isomeric covalent multi-indolyl hetero non-metallides: an account

Two or more indole molecules tailored to a single non-metal central atom, through any of their C2–7 positions are not only structurally engaging but also constitute a class of important pharmacophores. Although the body of such multi-indolyl non-metallide molecules are largely shared to the anticancer agent bis(indolyl)methane, other heteroatomic analogs also possess similar medicinal properties. This concise review will discuss various catalytic and uncatalytic synthetic strategies adopted for the synthesis of the non-ionic (non-metallic) versions of these important molecules till date.

Total synthesis of mangiferin, homomangiferin, and neomangiferin

Efficient synthesis of natural C-glycosyl xanthone mangiferin, homomangiferin and neomangiferin based on their biosynthetic pathway.

Concise total syntheses of aspalathin and nothofagin

Syntheses of the C-glycosyl flavone natural products aspalathin and nothofagin have been accomplished in eight steps from tribenzyl glucal, tribenzylphloroglucinol, and either 4-(benzyloxy)phenylacetylene or 3,4-bis(benzyloxy)phenylacetylene. The key step of the syntheses involves a highly stereoselective Lewis acid promoted coupling of 1,2-di-O-acyl-3,4,6-tribenzylglucose with tribenzylphloroglucinol, which gives rise to the corresponding beta-C-aryl glycoside in 30-65% yields.

BenzylN′-(4,6-dimethoxy-2-methyl-3-phenyl-1H-indol-7-ylmethylene)hydrazinecarbodithioate

The asymmetric unit of the title compound, C₂₆H₂₅N₃O₂S₂, contains two independent mol­ecules, which are linked by a pair of N—H⋯S hydrogen bonds, forming a dimer.