Dynamic Biphasic Counterion Exchange in a Configurationally Stable Aziridinium Ion: Efficient Synthesis and Isolation of a Koga C<sub>2</sub>-Symmetric Tetraamine Base
作者:Matthew J. Frizzle、Sebastien Caille、Teresa L. Marshall、Kenneth McRae、Kelly Nadeau、Gary Guo、Steven Wu、Michael J. Martinelli、George A. Moniz
DOI:10.1021/op0602371
日期:2007.3.1
An efficient synthetic process for chiral tetraamine base (R,R)-5 is reported that leverages mechanistic understanding to enable control over key transformations. Specifically, a configurationallystable and observable aziridinium ion intermediate was found to undergo counterion exchange impacting the feasibility of the process. Mechanistic investigations revealed that both counterion exchange and
Synthesis of a scalemic β-amino disulfide from (S)-phenylglycine and (R)-styrene oxide and use as a catalyst in enantioselective additions of diethylzinc to aldehydes
作者:David A. Fulton、Colin L. Gibson
DOI:10.1016/s0040-4039(97)00221-9
日期:1997.3
Two routes to the novel scalemic β-amino disulfide 7 have been developed from (S)-phenylglycine and (R)-styrene oxide. The β-amino disulfide 7 was used as a catalyst in the enantioselectiveaddition of diethylzinc to aldehydes providing (R)-secondary alcohols in 39–80% ee.