0000000001318636
AUTHOR
K. N. Houk
Chiral Brønsted Acid-Catalyzed Asymmetric Allyl(propargyl)boration Reaction of ortho-Alkynyl Benzaldehydes: Synthetic Applications and Factors Governing the Enantioselectivity
Chiral Bronsted acid-catalyzed allyl(propargyl)boration of ortho-alkynyl benzaldehydes gives rise to ω-alkynyl homoallylic(homopropargylic)alcohols that can be further transformed to complex molecular scaffolds via subsequent hydroalkoxylation, ring-closing enyne metathesis (RCEYM), or intramolecular Pauson–Khand reaction (PKR). Optimizations of each two-step transformation is reported. A strong dependence between enantioselectivities and the nature of the substitution at the alkynyl moiety is observed, showcasing that the triple bond is not merely a spectator in this transformation. Density functional theory (DFT) calculations (M06-2X/6-311+G(d,p)–IEFPCM//B3LYP/6-31G(d)) show that this dep…
CCDC 1434367: Experimental Crystal Structure Determination
Related Article: Elsa Rodríguez, Matthew N. Grayson, Amparo Asensio, Pablo Barrio, K. N. Houk, and Santos Fustero|2016|ACS Catalysis|6|2506|doi:10.1021/acscatal.6b00209
CCDC 1434366: Experimental Crystal Structure Determination
Related Article: Elsa Rodríguez, Matthew N. Grayson, Amparo Asensio, Pablo Barrio, K. N. Houk, and Santos Fustero|2016|ACS Catalysis|6|2506|doi:10.1021/acscatal.6b00209