Conformational effects on lipase-mediated acylations of 2-substituted cyclohexanols
摘要:
Lipase-mediated acetylations of trans- and cis-2-substituted cyclohexanols gave the corresponding (1R)-cyclohexyl acetates and (IS)-cyclohexanols in high yields and ee, but c-4-tert-butyl-c-2-ethenyl-r-l-cyclohexanoI was unreactive owing to the steric interaction between the axial OH group and the axial H atoms at the 3- and 5-positions. In the cis-isomer the OH group occupies an equatorial position to bind to the lipase, and less bulky axial alkenyl and alkynyl groups might not so much prevent acetylations than an alkyl group. (C) 2003 Elsevier Ltd. All rights reserved.
Palladium <scp>Iodide‐Catalyzed</scp> Selective Carbonylative Double Cyclization of 4‐(<scp>2‐Aminophenyl</scp>)‐3‐yn‐1‐ols to Dihydrofuroquinolinone Derivatives
作者:Raffaella Mancuso、Alex De Salvo、Patrizio Russo、Aurelia Falcicchio、Nicola Della Ca’、Leonardo Pantoja Munoz、Bartolo Gabriele
DOI:10.1002/cjoc.202300277
日期:2023.11
The PdI2/KI-catalyzed oxidative carbonylation of 4-(2-aminophenyl)-3-yn-1-ols, bearing two potential nucleophilic groups in suitable positionselectively leads to dihydrofuroquinolinone derivatives in fair to high yields (60%—89%) and excellent turnover numbers (180—267 mol of product per mol of Pd) over 19 examples, through a mechanistic pathway involving initial O-cyclization followed by N-cyclocarbonylation