bicycle: The thermodynamic stability of nitrogen‐containing heterocyclic ring systems is exploited in the first enantioselective totalsynthesis of bacilosarcins A and B, which has been achieved in simple two‐step sequences from amicoumacin C. Bacilosarcin A incorporates a totally unprecedented heterobicyclic ring system and exhibits a remarkably potent herbicidal activity.
JACOBSON R. M.; ABBASPOUR A.; LAHM G. P., J. ORG. CHEM., 1978, 43, NO 24, 4650-4652
作者:JACOBSON R. M.、 ABBASPOUR A.、 LAHM G. P.
DOI:——
日期:——
Electrophile-Dependent Alkylations of Lithiated 4-Alkoxyalk-4-enenitriles
作者:Bhaskar R. Pitta、Omar W. Steward、Fraser F. Fleming
DOI:10.1021/acs.joc.7b03205
日期:2018.3.2
Alkylations of acyclic, lithiated 4-alkoxyalk-4-enenitriles are highly diastereoselective with an unusual electrophile-dependent preference. Alkyl halides, sulfur, chlorine, and acyl cyanide electrophiles intercept a series of lithiated 4-alkoxyalk-4-enenitriles to install contiguous tertiary–quaternary stereocenters with high diastereoselectivity, whereas acylations with ester and carbonate electrophiles