[reaction: see text] Rh-Catalyzed intermolecularhydroacylation between salicylaldehydes and 1,5-hexadienes proceeded under remarkably mild reaction conditions to afford a mixture of iso- and normal-hydroacylated products in good yields. The experiments using deuterated salicylaldehyde-d revealed that "double chelation" of salicylaldehyde and 1,5-hexadiene to Rh-complex played vital roles in the catalytic
Rhodium‐Catalyzed Annulations of 1,3‐Dienes and Salicylaldehydes/2‐Hydroxybenzyl Alcohols Promoted by 2‐Ethylacrolein
作者:Hong‐Shuang Li、Yang Xiong、Guozhu Zhang
DOI:10.1002/adsc.201800796
日期:2018.11.5
2‐ethylacrolein‐promoted protocol enables the annulation reactions of 1,3‐dienes with either salicylaldehydes or 2‐hydroxybenzyl alcohols leading to 2‐alkylchroman‐4‐ones with high regioselectivity. This research highlights the use of 2‐ethylacrolein which probably serves as a tool of bidentate coordination to rhodium intermediates. Mechanistic studies reveal that the transformation proceeds through the 1,4‐hydroacylation
Cobalt-Catalyzed Annulation of Salicylaldehydes and Alkynes to Form Chromones and 4-Chromanones
作者:Junfeng Yang、Naohiko Yoshikai
DOI:10.1002/anie.201510999
日期:2016.2.18
A unique cobalt(I)–diphosphine catalytic system has been identified for the coupling of salicylaldehyde (SA) and an internal alkyne affording a dehydrogenative annulation product (chromone) or a reductive annulation product (4‐chromanone) depending on the alkyne substituents. Distinct from related rhodium(I)‐ and rhodium(III)‐catalyzed reactions of SA and alkynes, these annulation reactions feature
Shen, Zengming; Dornan, Peter K.; Khan, Hasan A., Journal of the American Chemical Society, 2009, vol. 131, p. 1077 - 1091
作者:Shen, Zengming、Dornan, Peter K.、Khan, Hasan A.、Woo, Tom K.、Dong, Vy M.
DOI:——
日期:——
Characterization of ground and electronically excited states of o-hydroxybenzaldehyde and its non-hydrogen-bonded photorotamer in 12 K rare gas matrixes
作者:Meredith A. Morgan、Edward. Orton、George C. Pimentel