Vanadium-Catalyzed Synthesis of Geometrically Defined Acyclic Tri- and Tetrasubstituted Olefins from Propargyl Alcohols
作者:Barry M. Trost、Jacob S. Tracy
DOI:10.1021/acscatal.8b04567
日期:2019.2.1
selective formation of geometricallydefined acyclic tri- and tetrasubstituted alkenes from inexpensive and readily available propargyl alcohols is described. Through vanadium oxo catalysis, tri- and tetrasubstituted α-chloro-, bromo-, and iodo-enone olefins can be synthesized with the kinetic E-geometry. Complementary tetrasubstituted β-chloro-, bromo-, and iodo-enone olefins with Z-geometry can be
Considered stable cations. 259. Application of the Gassman-Fentiman tool of increasing electron demand to the carbon-13 NMR spectroscopic study of 1-aryl-3-methylbut-2-enyl (allylic) and 2-arylpent-3-yn-2-yl (propargylic) cations
作者:G. K. Surya Prakash、V. V. Krishnamurthy、George A. Olah、D. G. Farnum
DOI:10.1021/ja00299a030
日期:1985.6
Alcohol Dehydrogenases and N‐Heterocyclic Carbene Gold(I) Catalysts: Design of a Chemoenzymatic Cascade towards Optically Active β,β‐Disubstituted Allylic Alcohols
combination of gold(I) and enzyme catalysis is used in a two-step approach, including Meyer–Schuster rearrangement of a series of readily available propargylicalcohols followed by stereoselective bioreduction of the corresponding allylic ketone intermediates, to provide optically pure β,β-disubstituted allylic alcohols. This cascade involves a gold N-heterocycliccarbene and an enzyme, demonstrating the