A Convergent Synthesis of CGS23305, A Thromboxane Synthase Inhibitor
作者:Andrew T. Bach、John A. Carlson、Peter P. Giannousis
DOI:10.1055/s-1999-3458
日期:1999.5
A convergent synthesis of CGS23305 was discovered. The route to the pyridine aldehyde intermediate 5 was reduced from four to two steps. The pyridine aldehyde was converted to the key pyridine aldehyde ester intermediate 7 via Miachel Addition of the N,N-diethylenamine 6 to ethyl acrylate. A Wittig alkenation using the multifunctional moiety 19 completed the carbons keleteon assembly. Hydrogenation and hydrolysis afforded CGS23305 in 44% overall yield from 14 (6 steps).