A LewisbaseassistedBrønstedbasecatalysis (LBABB) strategy is applied for directasymmetric vinylogous alkylation of allylic sulfones with Morita–Baylis–Hillman (MBH) carbonates, in which a strong Brønstedbase, tert‐butoxy anion, generated in situ from a tertiary amine catalyst and MBH carbonate, is crucial in activating unstabilized nucleophiles. The γ‐regioselective alkylation products were
C(sp2)−H allylation of racemic trisubstituted allenoates with Morita–Baylis–Hillman (MBH) carbonates to access axially chiral tetrasubstituted allenoates. Various trisubstituted allenoates and MBH carbonates were well tolerated under mild reaction conditions, providing novel chiral tetrasubstituted allenoates with adjacent axial chirality and tertiary carbon stereocenters in high yields with good to excellent
Organocatalytic diastereoselective [3+2] cyclization of MBH carbonates with dinucleophiles: synthesis of bicyclic imidazoline derivatives that inhibit MDM2–p53 interaction
作者:Hong-Ping Zhu、Ke Xie、Xiang-Hong He、Wei Huang、Rong Zeng、Yang Fan、Cheng Peng、Gu He、Bo Han
DOI:10.1039/c9cc05916d
日期:——
An efficient organocatalyticcyclization strategy was developed to synthesize pharmacologically interesting bicyclic imidazoline derivatives. Morita–Baylis–Hillman carbonates were applied as C3 electrophiles to react with N,C-dinucleophiles for the first time, yielding the desired products in good to excellent yields with outstanding diastereoselectivities. The optically pure bicyclic imidazolines
The first Lewis base-catalysed chemoselective asymmetric N-allylic alkylation of enamides with Morita–Baylis–Hillman carbonates has been developed, which affords multifunctional products in moderate to high enantioselectivity (up to 92% ee).