Staudinger et al., Helvetica Chimica Acta, 1923, vol. 6, p. 298
作者:Staudinger et al.
DOI:——
日期:——
Cyanoketenes. Mechanism of tert-butylcyanoketene cycloaddition to aldo- and ketoketenes
作者:Harold W. Moore、D. Scott Wilbur
DOI:10.1021/jo01310a042
日期:1980.10
BINAPHANE-Catalyzed Asymmetric Synthesis of <i>trans</i>-β-Lactams from Disubstituted Ketenes and <i>N</i>-Tosyl Arylimines
作者:Shi Chen、Eric C. Salo、Kraig A. Wheeler、Nessan J. Kerrigan
DOI:10.1021/ol3003783
日期:2012.4.6
The development of a BINAPHANE-catalyzed formal [2 + 2]-cycloaddition of disubstituted ketenes and inexpensive N-tosyl arylimines that provides access to a variety of highly substituted beta-lactams (16 examples) is described. The BINAPHANE catalytic system displays moderate to excellent enantioselectivity (up to 98% ee) and high diastereoselectivity in most cases, favoring formation of the trans-diastereomer (13 examples with >= 90:10).
225. The action of optically active alcohols on ketens