Synthesis of Morpholin-2-ones by Chemoselective Intramolecular Rhodium-Catalyzed Reductive Ring Expansion of Oxazolidines
摘要:
The rhodium-catalyzed reductive intramolecular ring expansion of N-(ethoxycarboxymethyl)oxazolidines was carried out under an atmosphere of carbon monoxide and hydrogen to afford N-methylmorpholin-2-ones in good to excellent yields.
Asymmetric synthesis X: A chiral pyrrolidine synthon for a new approach to the synthesis of alkaloids
作者:P.Q Huang、S Arseniyadis、H.-P Husson
DOI:10.1016/s0040-4039(00)95778-2
日期:1987.1
The synthesis of chiral 2-cyano-5-oxazolopyrrolidine is reported. The synthesis of the optically pure ant venom alkolaid, (+)-(S)--2-heptyl-5-butyl-pyrrolidine , has been achieved from .
centre at C-2 of the pyrrolidine ring. The first enantioselective synthesis of (+)-(S)-trans-2-heptyl-5-ethyl-pyrrolidine 9, a component of the venom of the ant Solenopsispunctaticeps served as an example of the method. Bothenantiomers of cis-2-heptyl-5-ethyl pyrrolidine 13 were obtained from the minor diastereomers 7 and 8 which were formed on reaction of oxazolidines 5a and 5b with Grignard reagents