Synthetic studies relevant to biosynthetic research on vitamin B12. Part 11. Modification of the east and west building blocks and study of different assembly methods for synthesis of isobacteriochlorins
作者:Alan R. Battersby、Michael H. Block、Finian J. Leeper、Steven C. Zimmerman
DOI:10.1039/p19920002189
日期:——
The eastern and western building blocks required for the photochemical route to isobacteriochlorins have been synthesized by a C–C bond-forming step which leaves a cyano group on the bridge carbon, e.g.5. Two methods have been developed to remove this cyano residue which use retro-Mannich reactions to eliminate either an aminomethyl group, resulting from reduction of the nitrile, or the corresponding