Enantiomerically pure α-methoxyaryl acetaldehydes as versatile precursors: a facile chemo-enzymatic methodology for their preparation
摘要:
A facile and efficient synthesis of optically active alpha-methoxyaryl acetic acids (up to 95% ee), alpha-methoxyaryl ethanols (up to 93% ee) and alpha-methoxyaryl acetonitriles (up to 93% ee) was achieved via Arthrobacter sp. lipase-catalyzed kinetic resolution of masked aldehydes as the key synthons, that is, alpha-hydroxyaryl acetaldehyde acetals. (C) 2008 Elsevier Ltd. All rights reserved.
Enantiomerically pure α-methoxyaryl acetaldehydes as versatile precursors: a facile chemo-enzymatic methodology for their preparation
摘要:
A facile and efficient synthesis of optically active alpha-methoxyaryl acetic acids (up to 95% ee), alpha-methoxyaryl ethanols (up to 93% ee) and alpha-methoxyaryl acetonitriles (up to 93% ee) was achieved via Arthrobacter sp. lipase-catalyzed kinetic resolution of masked aldehydes as the key synthons, that is, alpha-hydroxyaryl acetaldehyde acetals. (C) 2008 Elsevier Ltd. All rights reserved.
α-Hydroxydimethylacetal/ketal as an α-hydroxycarbonyl equivalent in interrupted Heyns/Amadori rearrangement: regioselective synthesis of substituted C2- and C3-acylindoles
作者:Minakshi Altia、Pazhamalai Anbarasan
DOI:10.1039/d4nj00771a
日期:——
intramolecular trapping of the aminoenol intermediate derived from o-acyl/formylanilines and α-hydroxydimethylacetals/ketals followed by rearrangement/aromatization in the presence of acid. Important features include the use of α-hydroxydimethylacetal/ketal as an α-hydroxycarbonyl equivalent, excellent regiocontrol, good functional group tolerance, selectivesynthesis of acylindoles, gram-scale synthesis, and