Allan S. Wagman

Ring-closing olefin meta thesis for the synthesis of fused nitrogen heterocycles

A novel technique for the efficient synthesis of fused nitrogen heterocycles containing various combinations of five- and eight-membered rings has been developed. This method features the ring-closing metathesis (RCM), which is catalyzed by the molybdenum alkylidene complex 6, of α,ω-dienes that have a nitrogen atom in the chain linking the two olefinic functional groups.

A general method for the synthesis of 1,1-difluoroalkylphosphonates

Abstract A facile method for preparing 1,1-difluoroalkylphosphonates has been developed that features radical deoxygenation of thionocarbonates derived from the adducts formed upon addition of 9 to aldehydes.

A NOVEL APPROACH TO FR-900482 VIA RING FORMING METATHESIS

Abstract The viability of the key step in our approach to the novel alkaloid FR-900482 ( 1 ) has been verified by the ring forming metathesis of 6 to give 7 .

Synthesis, Binding Mode, and Antihyperglycemic Activity of Potent and Selective (5-Imidazol-2-yl-4-phenylpyrimidin-2-yl)[2-(2-pyridylamino)ethyl]amine Inhibitors of Glycogen Synthase Kinase 3.

In an effort to identify new antidiabetic agents, we have discovered a novel family of (5-imidazol-2-yl-4-phenylpyrimidin-2-yl)[2-(2-pyridylamino)ethyl]amine analogues which are inhibitors of human glycogen synthase kinase 3 (GSK3). We developed efficient synthetic routes to explore a wide variety of substitution patterns and convergently access a diverse array of analogues. Compound 1 (CHIR-911, CT-99021, or CHIR-73911) emerged from an exploration of heterocycles at the C-5 position, phenyl groups at C-4, and a variety of differently substituted linker and aminopyridine moieties attached at the C-2 position. These compounds exhibited GSK3 IC50s in the low nanomolar range and excellent selectivity. They activate glycogen synthase in insulin receptor-expressing CHO-IR cells and primary rat hepatocytes. Evaluation of lead compounds 1 and 2 (CHIR-611 or CT-98014) in rodent models of type 2 diabetes revealed that single oral doses lowered hyperglycemia within 60 min, enhanced insulin-stimulated glucose transport, and improved glucose disposal without increasing insulin levels.