C–H functionalization enabled stereoselective Ugi-azide reaction to α-tetrazolyl alicyclic amines
作者:Surajit Haldar、Subhajit Saha、Sumana Mandal、Chandan K. Jana
DOI:10.1039/c8gc01544a
日期:——
novel reaction produces α-tetrazolyl N-heterocycles directly from N-heterocycles without involving pre-functionalization/pre-oxidation steps. Importantly, the stereoselective reaction involving chiral amines or chiral isocyanides allowed the expeditious syntheses of nucleoside analogs and α-tetrazolyl pyrrolidine in enantioenriched form.
Organocatalysis with proline derivatives: improved catalysts for the asymmetric Mannich, nitro-Michael and aldol reactions
作者:Alexander J. A. Cobb、David M. Shaw、Deborah A. Longbottom、Johan B. Gold、Steven V. Ley
DOI:10.1039/b414742a
日期:——
Tetrazole and acylsulfonamide organocatalysts derived from proline have been synthesised and applied to the asymmetric Mannich, nitro-Michael and aldol reactions to give results that are superior to the proline-catalysed counterpart.
8,9,10,10a-Tetrahydro-6<i>H</i>-tetrazolo[1,5-<i>a</i>]pyrrolo[2,1-<i>c</i>]pyrazines: New Heterocyclic Frameworks Generated by an Ugi-Type Multicomponent Reaction
A one-pot, Ugi-type three-component coupling process between an aldehyde, an isocyanide and proline tetrazole is reported, leading to new heterocyclic structures in good to excellent yields.
据报道,醛、异氰化物和脯氨酸四唑之间的一锅式 Ugi 型三组分偶联过程,以良好至优异的产率产生新的杂环结构。
WO2007/9716
申请人:——
公开号:——
公开(公告)日:——
Total Synthesis of the Marine Natural Product Hemiasterlin by Organocatalyzed α-Hydrazination
作者:Jan Hendrik Lang、Peter G. Jones、Thomas Lindel
DOI:10.1002/chem.201702812
日期:2017.9.18
efficient synthesis of the potently cytotoxic marine peptide hemiasterlin is presented. The tetramethyltryptophan moiety is assembled by tert‐prenylation of indole, followed by the high‐yielding organocatalyzed α‐hydrazination of a sterically congested aldehyde with excellent enantioselectivity. 2‐Bromo‐N‐ethylpyridinium tetrafluoroborate (BEP)‐mediated peptide coupling completes the synthesis, being