Effect of Tin(II) Triflate on Reactions of a-Ethoxycarbamates with Enolates
摘要:
Reactions of alpha-ethoxycarbamates (alpha-ethoxylated derivatives of N-ethoxycarbonylpyrrolidine, -piperidine, and -hexamethyleneimine) with various enolates (enol acetates, enol ethers, or tin(II) enolates of ketones) in the presence of tin(II) triflate are described.
Syntheses of (−)-hygrine and (−)-norhygrine via Wacker oxidation
作者:Mahesh S. Majik、Santosh G. Tilve
DOI:10.1016/j.tetlet.2010.03.098
日期:2010.5
Hygrine is an important biosynthetic intermediate for tropane alkaloids. A synthesis of (−)-hygrine starting from l-proline is described. The acetonyl side chain of hygrine was fashioned through the Wittig reaction followed by regioselective Wacker oxidation. In addition, this Letter provides the first synthesis of (−)-norhygrine.