Eco-friendly and efficient catalyst-free synthesis of N-sulfonylimines from sulfonamides and aldehydes: crucial role of Al2O3 as a reusable dehydrating agent
Oxazolidine Synthesis by Complementary Stereospecific and Stereoconvergent Methods
作者:Michael B. Shaghafi、Robin E. Grote、Elizabeth R. Jarvo
DOI:10.1021/ol202068p
日期:2011.10.7
stereospecific and stereoconvergent reactions for enantioselective synthesis of 1,3-oxazolidines are reported. In the presence of a rhodium catalyst, reaction of enantioenriched butadiene monoxide with aryl imines is stereospecific (99% ee). Alternatively, the reaction of racemic butadiene monoxide, in the presence of a chiral palladium or nickel catalyst, provides an enantioselective synthesis of 1,3-oxazolidines
Thermally Induced and Silver-Salt-Catalyzed [2+2] Cycloadditions of Imines to (Alkoxymethylene)cyclopropanes
作者:Itaru Nakamura、Tetsuya Nemoto、Yoshinori Yamamoto、Armin de Meijere
DOI:10.1002/anie.200600961
日期:2006.8.4
Eco-friendly and efficient catalyst-free synthesis of <i>N</i>-sulfonylimines from sulfonamides and aldehydes: crucial role of Al<sub>2</sub>O<sub>3</sub> as a reusable dehydrating agent
A green synthesis of N-sulfonylimines was developed involving the straightforward condensation of sulfonamides with aldehydes under green and catalyst-free conditions, mediated by neutral Al2O3 as an efficient and reusable dehydrating agent.