Triflimide: An Overlooked High-Performance Catalyst of the Mukaiyama Aldol Reaction of Silyl Ketene Acetals with Ketones
作者:Han Yong Bae、Benjamin List
DOI:10.1002/chem.201803142
日期:2018.9.18
The Mukaiyamaaldolreaction is a widely applied carbon–carbon bond forming reaction. However, despite numerous well‐established methods using aldehydes as acceptors, only few examples exist with ketones. Here we report a highly practical catalytic approach to this transformation, namely, the triflimide catalyzedMukaiyamaaldolreaction of silyl ketene acetals with ketones. This method exhibits a
Callipeltoside A: Total Synthesis, Assignment of the Absolute and Relative Configuration, and Evaluation of Synthetic Analogues
作者:Barry M. Trost、Janet L. Gunzner、Olivier Dirat、Young H. Rhee
DOI:10.1021/ja0205232
日期:2002.9.1
alkylation (AAA). The novelty of the latter protocol is its control of regioselectivity as well as absolute configuration. The trisubstituted olefin is generated using an alkene-alkyne coupling to create a trisubustituted olefin with complete control of geometry. The excellent chemo- and regioselectivity highlights the synthetic potential of this new ruthenium catalyzed process. The macrolactonization employs
Synthetic studies towards the group A streptogramin antibiotics. Synthesis of the C9–C23 fragment
作者:Chris J Brennan、Jean-Marc Campagne
DOI:10.1016/s0040-4039(01)00973-x
日期:2001.7
A synthesis of the C9–C23 subunit of the group A streptogramin antibiotics is described. The synthesis incorporates a palladium-catalysed sp–sp coupling and a catalytic asymmetric vinylogous Mukaiyama aldol reaction to induce the stereogenic centre at C14.
The Total Synthesis of Corallopyronin A and Myxopyronin B
作者:Andreas Rentsch、Markus Kalesse
DOI:10.1002/anie.201206560
日期:2012.11.5
Leading the way: The synthesis of natural products with new biological targets is one of the driving forces for the development of new antibiotics. The synthesis of the two secondary metabolites corallopyronin and myxopyronin (see picture) have been achieved, which are prominent leads for the inhibition of bacterial RNA polymerase.
Diastereoselective syntheses of substituted cis-hydrindanones featuring sequential inter- and intramolecular Michael reactions
作者:Junjia Liu、Maurice A. Marsini、T. Aaron Bedell、Paul J. Reider、Erik J. Sorensen
DOI:10.1016/j.tet.2016.03.039
日期:2016.6
substituted cis-1-hydrindanones enabled by a sequence of Michael reactions. A copper-catalyzed intermolecular Michael addition of a cyclic silyl ketene acetal to a β-substituted-α-alkoxycarbonyl-cyclopentenone enables construction of a quaternary center and is followed, after incorporation of an additional Michael acceptor, by a second, intramolecular addition of a nucleophilic β-ketoester. This strategy affords