Enantioselective Synthesis of a Chiral C3-Symmetric Bridgehead Amine
摘要:
An efficient enantioselective synthesis of the above C-3-symmetric chiral quinuclidine starting with N-tert-butoxycarbonyl-4-pyridone has been developed.
Toward Catalytic, Enantioselective Chlorolactonization of 1,2-Disubstituted Styrenyl Carboxylic Acids
作者:Scott E. Denmark、Pavel Ryabchuk、Matthew T. Burk、Bradley B. Gilbert
DOI:10.1021/acs.joc.6b01455
日期:2016.11.4
An investigation into the use of Lewis base catalysis for the enantioselective chlorolactonization of 1,2-disubstituted alkenoic acids is described. Two mechanistically distinct reaction pathways for catalytic chlorolactonization have been identified. Mechanistic investigation revealed that tertiary amines predominately operate as Brønsted rather than Lewis bases. Two potential modes of activation