Oxidative rearrangements of arylalkenes with [hydroxy(tosyloxy)iodo]benzene in 95% methanol: a general, regiospecific synthesis of α-aryl ketones
作者:Michael W. Justik、Gerald F. Koser
DOI:10.1016/j.tetlet.2004.06.029
日期:2004.8
The treatment of arylalkenes with [hydroxy(tosyloxy)iodo]benzene in 95% methanol affords the corresponding α-aryl ketones. This oxidative rearrangement is general for acyclic and cyclic arylalkenes and permits regioselective syntheses of isomeric α-phenyl ketone pairs.
using catalyticenantioselectivecyanosilylation of cyclohexyl phenyl ketone (9a) as a key step is described. The key reaction proceeded with 94% ee using 1 mol% of Gd-1 catalyst, and was performed on a 100 g-scale. In addition, a short catalyticenantioselective synthesis of the versatile intermediate for Scios Nova analogues of antimuscarinic agents (7) is described. Application of the catalytic enantioselective
practically synthesized using catalyticenantioselectivecyanosilylation of cyclohexyl phenyl ketone (6a) as a key step. Cyanohydrin 7a with 94% ee was obtained with 1 mol% of Gd-5 catalyst. The key α-hydroxy carboxylic acid 8 was synthesized from 7a in an enantiomerically pure form without column chromatography. Other cycloalkyl phenyl ketones, except cyclopentyl phenyl ketone (6e-H) gave products with
Reductive Arylation of Amides via a Nickel‐Catalyzed Suzuki–Miyaura‐Coupling and Transfer‐Hydrogenation Cascade
作者:Timothy B. Boit、Milauni M. Mehta、Junyong Kim、Emma L. Baker、Neil K. Garg
DOI:10.1002/anie.202012048
日期:2021.2
method takes advantage of non‐precious‐metal catalysis and allows for the facileconversion of amides to chiral alcohols via a one‐pot Suzuki–Miyaura cross‐coupling/transfer‐hydrogenation process. This study is anticipated to promote the development of new transformations that allow for the conversion of carboxylic acid derivatives to functional groups bearing stereogenic centers via cascade processes